How to use New method of formatter Package

1// Copyright 2015 The go-ethereum Authors2// This file is part of the go-ethereum library.3//4// The go-ethereum library is free software: you can redistribute it and/or modify5// it under the terms of the GNU Lesser General Public License as published by6// the Free Software Foundation, either version 3 of the License, or7// (at your option) any later version.8//9// The go-ethereum library is distributed in the hope that it will be useful,10// but WITHOUT ANY WARRANTY; without even the implied warranty of11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the12// GNU Lesser General Public License for more details.13//14// You should have received a copy of the GNU Lesser General Public License15// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.16// package web3ext contains geth specific web3.js extensions.17package web3ext18var Modules = map[string]string{19	"accounting": AccountingJs,20	"admin":      AdminJs,21	"chequebook": ChequebookJs,22	"clique":     CliqueJs,23	"ethash":     EthashJs,24	"debug":      DebugJs,25	"eth":        EthJs,26	"miner":      MinerJs,27	"net":        NetJs,28	"personal":   PersonalJs,29	"rpc":        RpcJs,30	"shh":        ShhJs,31	"swarmfs":    SwarmfsJs,32	"txpool":     TxpoolJs,33	"les":        LESJs,34}35const ChequebookJs = `36web3._extend({37	property: 'chequebook',38	methods: [39		new web3._extend.Method({40			name: 'deposit',41			call: 'chequebook_deposit',42			params: 1,43			inputFormatter: [null]44		}),45		new web3._extend.Property({46			name: 'balance',47			getter: 'chequebook_balance',48			outputFormatter: web3._extend.utils.toDecimal49		}),50		new web3._extend.Method({51			name: 'cash',52			call: 'chequebook_cash',53			params: 1,54			inputFormatter: [null]55		}),56		new web3._extend.Method({57			name: 'issue',58			call: 'chequebook_issue',59			params: 2,60			inputFormatter: [null, null]61		}),62	]63});64`65const CliqueJs = `66web3._extend({67	property: 'clique',68	methods: [69		new web3._extend.Method({70			name: 'getSnapshot',71			call: 'clique_getSnapshot',72			params: 1,73			inputFormatter: [web3._extend.utils.fromDecimal]74		}),75		new web3._extend.Method({76			name: 'getSnapshotAtHash',77			call: 'clique_getSnapshotAtHash',78			params: 179		}),80		new web3._extend.Method({81			name: 'getSigners',82			call: 'clique_getSigners',83			params: 1,84			inputFormatter: [web3._extend.utils.fromDecimal]85		}),86		new web3._extend.Method({87			name: 'getSignersAtHash',88			call: 'clique_getSignersAtHash',89			params: 190		}),91		new web3._extend.Method({92			name: 'propose',93			call: 'clique_propose',94			params: 295		}),96		new web3._extend.Method({97			name: 'discard',98			call: 'clique_discard',99			params: 1100		}),101		new web3._extend.Method({102			name: 'status',103			call: 'clique_status',104			params: 0105		}),106	],107	properties: [108		new web3._extend.Property({109			name: 'proposals',110			getter: 'clique_proposals'111		}),112	]113});114`115const EthashJs = `116web3._extend({117	property: 'ethash',118	methods: [119		new web3._extend.Method({120			name: 'getWork',121			call: 'ethash_getWork',122			params: 0123		}),124		new web3._extend.Method({125			name: 'getHashrate',126			call: 'ethash_getHashrate',127			params: 0128		}),129		new web3._extend.Method({130			name: 'submitWork',131			call: 'ethash_submitWork',132			params: 3,133		}),134		new web3._extend.Method({135			name: 'submitHashRate',136			call: 'ethash_submitHashRate',137			params: 2,138		}),139	]140});141`142const AdminJs = `143web3._extend({144	property: 'admin',145	methods: [146		new web3._extend.Method({147			name: 'addPeer',148			call: 'admin_addPeer',149			params: 1150		}),151		new web3._extend.Method({152			name: 'removePeer',153			call: 'admin_removePeer',154			params: 1155		}),156		new web3._extend.Method({157			name: 'addTrustedPeer',158			call: 'admin_addTrustedPeer',159			params: 1160		}),161		new web3._extend.Method({162			name: 'removeTrustedPeer',163			call: 'admin_removeTrustedPeer',164			params: 1165		}),166		new web3._extend.Method({167			name: 'exportChain',168			call: 'admin_exportChain',169			params: 3,170			inputFormatter: [null, null, null]171		}),172		new web3._extend.Method({173			name: 'importChain',174			call: 'admin_importChain',175			params: 1176		}),177		new web3._extend.Method({178			name: 'sleepBlocks',179			call: 'admin_sleepBlocks',180			params: 2181		}),182		new web3._extend.Method({183			name: 'startRPC',184			call: 'admin_startRPC',185			params: 4,186			inputFormatter: [null, null, null, null]187		}),188		new web3._extend.Method({189			name: 'stopRPC',190			call: 'admin_stopRPC'191		}),192		new web3._extend.Method({193			name: 'startWS',194			call: 'admin_startWS',195			params: 4,196			inputFormatter: [null, null, null, null]197		}),198		new web3._extend.Method({199			name: 'stopWS',200			call: 'admin_stopWS'201		}),202	],203	properties: [204		new web3._extend.Property({205			name: 'nodeInfo',206			getter: 'admin_nodeInfo'207		}),208		new web3._extend.Property({209			name: 'peers',210			getter: 'admin_peers'211		}),212		new web3._extend.Property({213			name: 'datadir',214			getter: 'admin_datadir'215		}),216	]217});218`219const DebugJs = `220web3._extend({221	property: 'debug',222	methods: [223		new web3._extend.Method({224			name: 'accountRange',225			call: 'debug_accountRange',226			params: 2227		}),228		new web3._extend.Method({229			name: 'printBlock',230			call: 'debug_printBlock',231			params: 1232		}),233		new web3._extend.Method({234			name: 'getBlockRlp',235			call: 'debug_getBlockRlp',236			params: 1237		}),238		new web3._extend.Method({239			name: 'testSignCliqueBlock',240			call: 'debug_testSignCliqueBlock',241			params: 2,242			inputFormatters: [web3._extend.formatters.inputAddressFormatter, null],243		}),244		new web3._extend.Method({245			name: 'setHead',246			call: 'debug_setHead',247			params: 1248		}),249		new web3._extend.Method({250			name: 'seedHash',251			call: 'debug_seedHash',252			params: 1253		}),254		new web3._extend.Method({255			name: 'dumpBlock',256			call: 'debug_dumpBlock',257			params: 1258		}),259		new web3._extend.Method({260			name: 'chaindbProperty',261			call: 'debug_chaindbProperty',262			params: 1,263			outputFormatter: console.log264		}),265		new web3._extend.Method({266			name: 'chaindbCompact',267			call: 'debug_chaindbCompact',268		}),269		new web3._extend.Method({270			name: 'verbosity',271			call: 'debug_verbosity',272			params: 1273		}),274		new web3._extend.Method({275			name: 'vmodule',276			call: 'debug_vmodule',277			params: 1278		}),279		new web3._extend.Method({280			name: 'backtraceAt',281			call: 'debug_backtraceAt',282			params: 1,283		}),284		new web3._extend.Method({285			name: 'stacks',286			call: 'debug_stacks',287			params: 0,288			outputFormatter: console.log289		}),290		new web3._extend.Method({291			name: 'freeOSMemory',292			call: 'debug_freeOSMemory',293			params: 0,294		}),295		new web3._extend.Method({296			name: 'setGCPercent',297			call: 'debug_setGCPercent',298			params: 1,299		}),300		new web3._extend.Method({301			name: 'memStats',302			call: 'debug_memStats',303			params: 0,304		}),305		new web3._extend.Method({306			name: 'gcStats',307			call: 'debug_gcStats',308			params: 0,309		}),310		new web3._extend.Method({311			name: 'cpuProfile',312			call: 'debug_cpuProfile',313			params: 2314		}),315		new web3._extend.Method({316			name: 'startCPUProfile',317			call: 'debug_startCPUProfile',318			params: 1319		}),320		new web3._extend.Method({321			name: 'stopCPUProfile',322			call: 'debug_stopCPUProfile',323			params: 0324		}),325		new web3._extend.Method({326			name: 'goTrace',327			call: 'debug_goTrace',328			params: 2329		}),330		new web3._extend.Method({331			name: 'startGoTrace',332			call: 'debug_startGoTrace',333			params: 1334		}),335		new web3._extend.Method({336			name: 'stopGoTrace',337			call: 'debug_stopGoTrace',338			params: 0339		}),340		new web3._extend.Method({341			name: 'blockProfile',342			call: 'debug_blockProfile',343			params: 2344		}),345		new web3._extend.Method({346			name: 'setBlockProfileRate',347			call: 'debug_setBlockProfileRate',348			params: 1349		}),350		new web3._extend.Method({351			name: 'writeBlockProfile',352			call: 'debug_writeBlockProfile',353			params: 1354		}),355		new web3._extend.Method({356			name: 'mutexProfile',357			call: 'debug_mutexProfile',358			params: 2359		}),360		new web3._extend.Method({361			name: 'setMutexProfileFraction',362			call: 'debug_setMutexProfileFraction',363			params: 1364		}),365		new web3._extend.Method({366			name: 'writeMutexProfile',367			call: 'debug_writeMutexProfile',368			params: 1369		}),370		new web3._extend.Method({371			name: 'writeMemProfile',372			call: 'debug_writeMemProfile',373			params: 1374		}),375		new web3._extend.Method({376			name: 'traceBlock',377			call: 'debug_traceBlock',378			params: 2,379			inputFormatter: [null, null]380		}),381		new web3._extend.Method({382			name: 'traceBlockFromFile',383			call: 'debug_traceBlockFromFile',384			params: 2,385			inputFormatter: [null, null]386		}),387		new web3._extend.Method({388			name: 'traceBadBlock',389			call: 'debug_traceBadBlock',390			params: 1,391			inputFormatter: [null]392		}),393		new web3._extend.Method({394			name: 'standardTraceBadBlockToFile',395			call: 'debug_standardTraceBadBlockToFile',396			params: 2,397			inputFormatter: [null, null]398		}),399		new web3._extend.Method({400			name: 'standardTraceBlockToFile',401			call: 'debug_standardTraceBlockToFile',402			params: 2,403			inputFormatter: [null, null]404		}),405		new web3._extend.Method({406			name: 'traceBlockByNumber',407			call: 'debug_traceBlockByNumber',408			params: 2,409			inputFormatter: [null, null]410		}),411		new web3._extend.Method({412			name: 'traceBlockByHash',413			call: 'debug_traceBlockByHash',414			params: 2,415			inputFormatter: [null, null]416		}),417		new web3._extend.Method({418			name: 'traceTransaction',419			call: 'debug_traceTransaction',420			params: 2,421			inputFormatter: [null, null]422		}),423		new web3._extend.Method({424			name: 'preimage',425			call: 'debug_preimage',426			params: 1,427			inputFormatter: [null]428		}),429		new web3._extend.Method({430			name: 'getBadBlocks',431			call: 'debug_getBadBlocks',432			params: 0,433		}),434		new web3._extend.Method({435			name: 'storageRangeAt',436			call: 'debug_storageRangeAt',437			params: 5,438		}),439		new web3._extend.Method({440			name: 'getModifiedAccountsByNumber',441			call: 'debug_getModifiedAccountsByNumber',442			params: 2,443			inputFormatter: [null, null],444		}),445		new web3._extend.Method({446			name: 'getModifiedAccountsByHash',447			call: 'debug_getModifiedAccountsByHash',448			params: 2,449			inputFormatter:[null, null],450		}),451		new web3._extend.Method({452			name: 'freezeClient',453			call: 'debug_freezeClient',454			params: 1,455		}),456	],457	properties: []458});459`460const EthJs = `461web3._extend({462	property: 'eth',463	methods: [464		new web3._extend.Method({465			name: 'chainId',466			call: 'eth_chainId',467			params: 0468		}),469		new web3._extend.Method({470			name: 'sign',471			call: 'eth_sign',472			params: 2,473			inputFormatter: [web3._extend.formatters.inputAddressFormatter, null]474		}),475		new web3._extend.Method({476			name: 'resend',477			call: 'eth_resend',478			params: 3,479			inputFormatter: [web3._extend.formatters.inputTransactionFormatter, web3._extend.utils.fromDecimal, web3._extend.utils.fromDecimal]480		}),481		new web3._extend.Method({482			name: 'signTransaction',483			call: 'eth_signTransaction',484			params: 1,485			inputFormatter: [web3._extend.formatters.inputTransactionFormatter]486		}),487		new web3._extend.Method({488			name: 'submitTransaction',489			call: 'eth_submitTransaction',490			params: 1,491			inputFormatter: [web3._extend.formatters.inputTransactionFormatter]492		}),493		new web3._extend.Method({494			name: 'fillTransaction',495			call: 'eth_fillTransaction',496			params: 1,497			inputFormatter: [web3._extend.formatters.inputTransactionFormatter]498		}),499		new web3._extend.Method({500			name: 'getHeaderByNumber',501			call: 'eth_getHeaderByNumber',502			params: 1503		}),504		new web3._extend.Method({505			name: 'getHeaderByHash',506			call: 'eth_getHeaderByHash',507			params: 1508		}),509		new web3._extend.Method({510			name: 'getBlockByNumber',511			call: 'eth_getBlockByNumber',512			params: 2513		}),514		new web3._extend.Method({515			name: 'getBlockByHash',516			call: 'eth_getBlockByHash',517			params: 2518		}),519		new web3._extend.Method({520			name: 'getRawTransaction',521			call: 'eth_getRawTransactionByHash',522			params: 1523		}),524		new web3._extend.Method({525			name: 'getRawTransactionFromBlock',526			call: function(args) {527				return (web3._extend.utils.isString(args[0]) && args[0].indexOf('0x') === 0) ? 'eth_getRawTransactionByBlockHashAndIndex' : 'eth_getRawTransactionByBlockNumberAndIndex';528			},529			params: 2,530			inputFormatter: [web3._extend.formatters.inputBlockNumberFormatter, web3._extend.utils.toHex]531		}),532		new web3._extend.Method({533			name: 'getProof',534			call: 'eth_getProof',535			params: 3,536			inputFormatter: [web3._extend.formatters.inputAddressFormatter, null, web3._extend.formatters.inputBlockNumberFormatter]537		}),538	],539	properties: [540		new web3._extend.Property({541			name: 'pendingTransactions',542			getter: 'eth_pendingTransactions',543			outputFormatter: function(txs) {544				var formatted = [];545				for (var i = 0; i < txs.length; i++) {546					formatted.push(web3._extend.formatters.outputTransactionFormatter(txs[i]));547					formatted[i].blockHash = null;548				}549				return formatted;550			}551		}),552	]553});554`555const MinerJs = `556web3._extend({557	property: 'miner',558	methods: [559		new web3._extend.Method({560			name: 'start',561			call: 'miner_start',562			params: 1,563			inputFormatter: [null]564		}),565		new web3._extend.Method({566			name: 'stop',567			call: 'miner_stop'568		}),569		new web3._extend.Method({570			name: 'setEtherbase',571			call: 'miner_setEtherbase',572			params: 1,573			inputFormatter: [web3._extend.formatters.inputAddressFormatter]574		}),575		new web3._extend.Method({576			name: 'setExtra',577			call: 'miner_setExtra',578			params: 1579		}),580		new web3._extend.Method({581			name: 'setGasPrice',582			call: 'miner_setGasPrice',583			params: 1,584			inputFormatter: [web3._extend.utils.fromDecimal]585		}),586		new web3._extend.Method({587			name: 'setRecommitInterval',588			call: 'miner_setRecommitInterval',589			params: 1,590		}),591		new web3._extend.Method({592			name: 'getHashrate',593			call: 'miner_getHashrate'594		}),595	],596	properties: []597});598`599const NetJs = `600web3._extend({601	property: 'net',602	methods: [],603	properties: [604		new web3._extend.Property({605			name: 'version',606			getter: 'net_version'607		}),608	]609});610`611const PersonalJs = `612web3._extend({613	property: 'personal',614	methods: [615		new web3._extend.Method({616			name: 'importRawKey',617			call: 'personal_importRawKey',618			params: 2619		}),620		new web3._extend.Method({621			name: 'sign',622			call: 'personal_sign',623			params: 3,624			inputFormatter: [null, web3._extend.formatters.inputAddressFormatter, null]625		}),626		new web3._extend.Method({627			name: 'ecRecover',628			call: 'personal_ecRecover',629			params: 2630		}),631		new web3._extend.Method({632			name: 'openWallet',633			call: 'personal_openWallet',634			params: 2635		}),636		new web3._extend.Method({637			name: 'deriveAccount',638			call: 'personal_deriveAccount',639			params: 3640		}),641		new web3._extend.Method({642			name: 'signTransaction',643			call: 'personal_signTransaction',644			params: 2,645			inputFormatter: [web3._extend.formatters.inputTransactionFormatter, null]646		}),647		new web3._extend.Method({648			name: 'unpair',649			call: 'personal_unpair',650			params: 2651		}),652		new web3._extend.Method({653			name: 'initializeWallet',654			call: 'personal_initializeWallet',655			params: 1656		})657	],658	properties: [659		new web3._extend.Property({660			name: 'listWallets',661			getter: 'personal_listWallets'662		}),663	]664})665`666const RpcJs = `667web3._extend({668	property: 'rpc',669	methods: [],670	properties: [671		new web3._extend.Property({672			name: 'modules',673			getter: 'rpc_modules'674		}),675	]676});677`678const ShhJs = `679web3._extend({680	property: 'shh',681	methods: [682	],683	properties:684	[685		new web3._extend.Property({686			name: 'version',687			getter: 'shh_version',688			outputFormatter: web3._extend.utils.toDecimal689		}),690		new web3._extend.Property({691			name: 'info',692			getter: 'shh_info'693		}),694	]695});696`697const SwarmfsJs = `698web3._extend({699	property: 'swarmfs',700	methods:701	[702		new web3._extend.Method({703			name: 'mount',704			call: 'swarmfs_mount',705			params: 2706		}),707		new web3._extend.Method({708			name: 'unmount',709			call: 'swarmfs_unmount',710			params: 1711		}),712		new web3._extend.Method({713			name: 'listmounts',714			call: 'swarmfs_listmounts',715			params: 0716		}),717	]718});719`720const TxpoolJs = `721web3._extend({722	property: 'txpool',723	methods: [],724	properties:725	[726		new web3._extend.Property({727			name: 'content',728			getter: 'txpool_content'729		}),730		new web3._extend.Property({731			name: 'inspect',732			getter: 'txpool_inspect'733		}),734		new web3._extend.Property({735			name: 'status',736			getter: 'txpool_status',737			outputFormatter: function(status) {738				status.pending = web3._extend.utils.toDecimal(status.pending);739				status.queued = web3._extend.utils.toDecimal(status.queued);740				return status;741			}742		}),743	]744});745`746const AccountingJs = `747web3._extend({748	property: 'accounting',749	methods: [750		new web3._extend.Property({751			name: 'balance',752			getter: 'account_balance'753		}),754		new web3._extend.Property({755			name: 'balanceCredit',756			getter: 'account_balanceCredit'757		}),758		new web3._extend.Property({759			name: 'balanceDebit',760			getter: 'account_balanceDebit'761		}),762		new web3._extend.Property({763			name: 'bytesCredit',764			getter: 'account_bytesCredit'765		}),766		new web3._extend.Property({767			name: 'bytesDebit',768			getter: 'account_bytesDebit'769		}),770		new web3._extend.Property({771			name: 'msgCredit',772			getter: 'account_msgCredit'773		}),774		new web3._extend.Property({775			name: 'msgDebit',776			getter: 'account_msgDebit'777		}),778		new web3._extend.Property({779			name: 'peerDrops',780			getter: 'account_peerDrops'781		}),782		new web3._extend.Property({783			name: 'selfDrops',784			getter: 'account_selfDrops'785		}),786	]787});788`789const LESJs = `790web3._extend({791	property: 'les',792	methods:793	[794		new web3._extend.Method({795			name: 'getCheckpoint',796			call: 'les_getCheckpoint',797			params: 1798		}),799		new web3._extend.Method({800			name: 'clientInfo',801			call: 'les_clientInfo',802			params: 1803		}),804		new web3._extend.Method({805			name: 'priorityClientInfo',806			call: 'les_priorityClientInfo',807			params: 3808		}),809		new web3._extend.Method({810			name: 'setClientParams',811			call: 'les_setClientParams',812			params: 2813		}),814		new web3._extend.Method({815			name: 'setDefaultParams',816			call: 'les_setDefaultParams',817			params: 1818		}),819		new web3._extend.Method({820			name: 'addBalance',821			call: 'les_addBalance',822			params: 3823		}),824	],825	properties:826	[827		new web3._extend.Property({828			name: 'latestCheckpoint',829			getter: 'les_latestCheckpoint'830		}),831		new web3._extend.Property({832			name: 'checkpointContractAddress',833			getter: 'les_getCheckpointContractAddress'834		}),835		new web3._extend.Property({836			name: 'serverInfo',837			getter: 'les_serverInfo'838		}),839	]840});841`...

...18	"fmt"19	"io"20)21// Errorf is a wrapper for fmt.Errorf that treats each argument as if it were22// passed with a default Formatter interface returned by NewFormatter.  It23// returns the formatted string as a value that satisfies error.  See24// NewFormatter for formatting details.25//26// This function is shorthand for the following syntax:27//28//	fmt.Errorf(format, spew.NewFormatter(a), spew.NewFormatter(b))29func Errorf(format string, a ...interface{}) (err error) {30	return fmt.Errorf(format, convertArgs(a)...)31}32// Fprint is a wrapper for fmt.Fprint that treats each argument as if it were33// passed with a default Formatter interface returned by NewFormatter.  It34// returns the number of bytes written and any write error encountered.  See35// NewFormatter for formatting details.36//37// This function is shorthand for the following syntax:38//39//	fmt.Fprint(w, spew.NewFormatter(a), spew.NewFormatter(b))40func Fprint(w io.Writer, a ...interface{}) (n int, err error) {41	return fmt.Fprint(w, convertArgs(a)...)42}43// Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were44// passed with a default Formatter interface returned by NewFormatter.  It45// returns the number of bytes written and any write error encountered.  See46// NewFormatter for formatting details.47//48// This function is shorthand for the following syntax:49//50//	fmt.Fprintf(w, format, spew.NewFormatter(a), spew.NewFormatter(b))51func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {52	return fmt.Fprintf(w, format, convertArgs(a)...)53}54// Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it55// passed with a default Formatter interface returned by NewFormatter.  See56// NewFormatter for formatting details.57//58// This function is shorthand for the following syntax:59//60//	fmt.Fprintln(w, spew.NewFormatter(a), spew.NewFormatter(b))61func Fprintln(w io.Writer, a ...interface{}) (n int, err error) {62	return fmt.Fprintln(w, convertArgs(a)...)63}64// Print is a wrapper for fmt.Print that treats each argument as if it were65// passed with a default Formatter interface returned by NewFormatter.  It66// returns the number of bytes written and any write error encountered.  See67// NewFormatter for formatting details.68//69// This function is shorthand for the following syntax:70//71//	fmt.Print(spew.NewFormatter(a), spew.NewFormatter(b))72func Print(a ...interface{}) (n int, err error) {73	return fmt.Print(convertArgs(a)...)74}75// Printf is a wrapper for fmt.Printf that treats each argument as if it were76// passed with a default Formatter interface returned by NewFormatter.  It77// returns the number of bytes written and any write error encountered.  See78// NewFormatter for formatting details.79//80// This function is shorthand for the following syntax:81//82//	fmt.Printf(format, spew.NewFormatter(a), spew.NewFormatter(b))83func Printf(format string, a ...interface{}) (n int, err error) {84	return fmt.Printf(format, convertArgs(a)...)85}86// Println is a wrapper for fmt.Println that treats each argument as if it were87// passed with a default Formatter interface returned by NewFormatter.  It88// returns the number of bytes written and any write error encountered.  See89// NewFormatter for formatting details.90//91// This function is shorthand for the following syntax:92//93//	fmt.Println(spew.NewFormatter(a), spew.NewFormatter(b))94func Println(a ...interface{}) (n int, err error) {95	return fmt.Println(convertArgs(a)...)96}97// Sprint is a wrapper for fmt.Sprint that treats each argument as if it were98// passed with a default Formatter interface returned by NewFormatter.  It99// returns the resulting string.  See NewFormatter for formatting details.100//101// This function is shorthand for the following syntax:102//103//	fmt.Sprint(spew.NewFormatter(a), spew.NewFormatter(b))104func Sprint(a ...interface{}) string {105	return fmt.Sprint(convertArgs(a)...)106}107// Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were108// passed with a default Formatter interface returned by NewFormatter.  It109// returns the resulting string.  See NewFormatter for formatting details.110//111// This function is shorthand for the following syntax:112//113//	fmt.Sprintf(format, spew.NewFormatter(a), spew.NewFormatter(b))114func Sprintf(format string, a ...interface{}) string {115	return fmt.Sprintf(format, convertArgs(a)...)116}117// Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it118// were passed with a default Formatter interface returned by NewFormatter.  It119// returns the resulting string.  See NewFormatter for formatting details.120//121// This function is shorthand for the following syntax:122//123//	fmt.Sprintln(spew.NewFormatter(a), spew.NewFormatter(b))124func Sprintln(a ...interface{}) string {125	return fmt.Sprintln(convertArgs(a)...)126}127// convertArgs accepts a slice of arguments and returns a slice of the same128// length with each argument converted to a default spew Formatter interface.129func convertArgs(args []interface{}) (formatters []interface{}) {130	formatters = make([]interface{}, len(args))131	for index, arg := range args {132		formatters[index] = NewFormatter(arg)133	}134	return formatters135}...

1import (2func main() {3	t := time.Now()4	fmt.Println(t.Format("2006-01-02 15:04:05.000000"))5	fmt.Println(t.Format("2006-01-02 15:04:05.000000000"))6	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST"))7	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday"))8	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday January"))9	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday January 2"))10	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday January 2 2006"))11	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday January 2 2006 Monday"))12	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday January 2 2006 Monday 15"))13	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday January 2 2006 Monday 15:04"))14	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday January 2 2006 Monday 15:04:05"))15	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday January 2 2006 Monday 15:04:05.000000"))16	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday January 2 2006 Monday 15:04:05.000000000"))17	fmt.Println(t.Format("2006-01-02 15:04:05.000000000 -0700 MST Monday January 2 2006 Monday 15:04:05.000000000 -0700 MST"))18	fmt.Println(t.Format("2006

1import "fmt"2func main() {3    fmt.Println("Hello, playground")4}5import "fmt"6func main() {7    fmt.Println("Hello, playground")8}9import "fmt"10func main() {11    fmt.Println("Hello, playground")12}13import "fmt"14func main() {15    fmt.Println("Hello, playground")16}17import "fmt"18func main() {19    fmt.Println("Hello, playground")20}21import "fmt"22func main() {23    fmt.Println("Hello, playground")24}25import "fmt"26func main() {27    fmt.Println("Hello, playground")28}29import "fmt"30func main() {31    fmt.Println("Hello, playground")32}33import "fmt"34func main() {35    fmt.Println("Hello, playground")36}37import "fmt"38func main() {39    fmt.Println("Hello, playground")40}41import "fmt"42func main() {43    fmt.Println("Hello, playground")44}45import "fmt"46func main() {47    fmt.Println("Hello, playground")48}49import "fmt"50func main() {51    fmt.Println("Hello, playground")52}53import "fmt"54func main() {55    fmt.Println("Hello, playground")56}57import "fmt"58func main() {59    fmt.Println("Hello, playground")60}

1import (2func main() {3   t := time.Now()4   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 MST 2006"))5   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -0700 2006"))6   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -07:00 2006"))7   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -07:00 MST 2006"))8   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -0700 MST 2006"))9   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 MST -0700 2006"))10   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -0700 MST"))11   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 MST -0700"))12   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -07:00"))13   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -07"))14   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -7"))15   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -7:00"))16   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -7:00 MST"))17   fmt.Println("Today is", t.Format("Mon Jan 2 15:04:05 -7:00 MST 2006"))18}

1import (2func main() {3	f := fmt.New(os.Stdout, "prefix: ", 0)4	f.Print("Hello, World!5	fmt.Fprintf(os.Stdout, "Hello, %s!6	fmt.Printf("Hello, %s!7}8type Formatter interface {9	Format(f State, c rune)10}11type Formatter interface {12	Format(f State, c rune)13}14type State interface {15	WriteString(string) (int, error)16}17type State interface {18	WriteString(string) (int, error)19}20import (21func main() {22	fmt.Fprintf(os.Stdout, "Hello, %s!23	fmt.Printf("Hello, %s!24	fmt.Fprintf(os.Stdout, "Hello, %s!

1import "fmt"2func main() {3    f := formatter.New("Go")4    f.Print("Hello")5}6import "fmt"7func main() {8    f := formatter.New("Go")9    f.Print("Hello")10}11import "fmt"12func main() {13    f := formatter.New("Go")14    f.Print("Hello")15}16import "fmt"17func main() {18    f := formatter.New("Go")19    f.Print("Hello")20}21import "fmt"22func main() {23    f := formatter.New("Go")24    f.Print("Hello")25}26import "fmt"27func main() {28    f := formatter.New("Go")29    f.Print("Hello")30}31import "fmt"32func main() {33    f := formatter.New("Go")34    f.Print("Hello")35}36import "fmt"37func main() {38    f := formatter.New("Go")39    f.Print("Hello")40}41import "fmt"42func main() {43    f := formatter.New("Go")44    f.Print("Hello")45}46import "fmt"47func main() {48    f := formatter.New("Go")49    f.Print("Hello")50}51import "fmt"52func main() {53    f := formatter.New("Go")54    f.Print("Hello")55}56import "fmt"57func main() {58    f := formatter.New("Go")59    f.Print("Hello")

1import (2func main() {3    file, err := os.OpenFile("log.txt", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)4    if err != nil {5        log.Fatalf("error opening file: %v", err)6    }7    defer file.Close()8    log.SetOutput(file)9    log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)10    log.Println("This is a log entry")11}12import (13func main() {14    file, err := os.OpenFile("log.txt", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)15    if err != nil {16        log.Fatalf("error opening file: %v", err)17    }18    defer file.Close()19    log.SetOutput(file)20    log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)21    log.Println("This is a log entry")22}23func TestSomething(t *testing.T) {

1import (2func main() {3    f := new(strings.Builder)4    fmt.Fprintf(f, "Hello, %s", "Gopher")5    s := f.String()6    fmt.Println(s)7}8Related posts: Go | strings.Builder.String() method in Golang Go | strings.Builder.Reset() method in Golang Golang | strings.Builder.Write() method in Golang Golang | strings.Builder.WriteRune() method in Golang Golang | strings.Builder.WriteByte() method in Golang Golang | strings.Builder.Cap() method in Golang Golang | strings.Builder.Grow() method in Golang Golang | strings.Builder.Len() method in Golang Golang | strings.Builder.String() method in Golang Golang | strings.Builder.WriteString() method in Golang Golang | strings.Builder.WriteTo() method in Golang Golang | strings.Builder.WriteRune() method in Golang Golang | strings.Builder.WriteByte() method in Golang Golang | strings.Builder.Write() method in Golang Golang | strings.Builder.Reset() method in Golang Golang | strings.Builder.String() method in Golang Golang | strings.Builder.New() method in Golang Golang | strings.Builder.Len() method in Golang Golang | strings.Builder.Grow() method in Golang Golang | strings.Builder.Cap() method in Golang Golang | strings.Builder.WriteTo() method in Golang Golang | strings.Builder.WriteString() method in Golang Golang | strings.Builder.Write() method in Golang Golang | strings.Builder.WriteRune() method in Golang Golang | strings.Builder.WriteByte() method in Golang Golang | strings.Builder.Reset() method in Golang Golang | strings.Builder.String() method in Golang Golang | strings.Builder.Len() method in Golang Golang | strings.Builder.Grow() method in Golang Golang | strings.Builder.Cap() method in Golang Golang | strings.Builder.WriteTo() method in Golang Golang | strings.Builder.WriteString() method in Golang Golang | strings.Builder.WriteRune() method in Golang Golang | strings.Builder.WriteByte() method in Golang Golang | strings.Builder.Write() method in Golang Golang | strings.Builder.Reset() method

1import "fmt"2func main() {3    formatter := fmt.New()4    formatter.Println("Hello World!")5}6type Formatter interface {7    Format(f State, verb rune) (n int, err error)8}9import (10type customType struct {11}12func (c customType) String() string {13}14func (c customType) Format(f fmt.State, verb rune) {15    switch verb {16        if f.Flag('+') {17            f.Write([]byte("Hello"))18        }19        f.Write([]byte(c.name))20    }21}22func main() {23    formatter := fmt.New()24    c := customType{name: "World"}25    formatter.Printf("%v26    formatter.Printf("%+v27    os.Exit(0)28}29type GoStringer interface {30    GoString() string

1import (2func main() {3	formatter := fmt.Formatter("This is a string")4	fmt.Println(formatter)5}6import (7func main() {8	fmt.Println("Hello", "world", "!")9}10import (11func main() {12	fmt.Printf("This is %s", "string")13}14import (15func main() {16	fmt.Println(fmt.Sprintf("This is %s", "string"))17}18import (19func main() {20	fmt.Fprintf(os.Stdout, "This is %s", "string")21}22import (23func main() {