# How to use decomposeDouble method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

DoubleHelpers.spec.ts

Source:DoubleHelpers.spec.ts

`...15 return BigInt(index.sign) * ((BigInt(index.data[0]) << BigInt(32)) + BigInt(index.data[1]));16};17describe('decomposeDouble', () => {18 it('should properly decompose basic values', () => {19 expect(decomposeDouble(0)).toEqual({ exponent: -1022, significand: 0 });20 expect(decomposeDouble(1)).toEqual({ exponent: 0, significand: 1 });21 expect(decomposeDouble(128)).toEqual({ exponent: 7, significand: 1 });22 expect(decomposeDouble(201)).toEqual({ exponent: 7, significand: 1.5703125 });23 });24 it('should properly decompose negative values', () => {25 expect(decomposeDouble(-0)).toEqual({ exponent: -1022, significand: -0 });26 expect(decomposeDouble(-1)).toEqual({ exponent: 0, significand: -1 });27 });28 it('should properly decompose extreme values', () => {29 expect(decomposeDouble(Number.MAX_VALUE)).toEqual({ exponent: 1023, significand: 2 - Number.EPSILON });30 expect(decomposeDouble(Number.MIN_VALUE)).toEqual({ exponent: -1022, significand: Number.EPSILON });31 expect(decomposeDouble(Number.EPSILON)).toEqual({ exponent: -52, significand: 1 });32 expect(decomposeDouble(1 + Number.EPSILON)).toEqual({ exponent: 0, significand: 1 + Number.EPSILON });33 });34 it('should decompose a 64-bit float into its equivalent (significand, exponent)', () => {35 fc.assert(36 fc.property(float64raw(), (f64) => {37 // Arrange38 fc.pre(!Number.isNaN(f64));39 // Act40 const { exponent, significand } = decomposeDouble(f64);41 // Assert42 expect(significand * 2 ** exponent).toBe(f64);43 })44 );45 });46});47describe('doubleToIndex', () => {48 it('should always produce well-formed indexes', () => {49 fc.assert(50 fc.property(float64raw(), (d) => {51 // Arrange52 fc.pre(!Number.isNaN(d));53 // Act54 const index = doubleToIndex(d);...`

DoubleHelpers.ts

Source:DoubleHelpers.ts

`...21 * @param d - 64-bit floating point number to be decomposed into (significand, exponent)22 *23 * @internal24 */25export function decomposeDouble(d: number): { exponent: number; significand: number } {26 // 1 => significand 0b1 - exponent 1 (will be preferred)27 // => significand 0b0.1 - exponent 228 const maxSignificand = 2 - safeEpsilon;29 for (let exponent = -1022; exponent !== 1024; ++exponent) {30 const powExponent = 2 ** exponent;31 const maxForExponent = maxSignificand * powExponent;32 if (Math.abs(d) <= maxForExponent) {33 return { exponent, significand: d / powExponent };34 }35 }36 return { exponent: safeNaN, significand: safeNaN };37}38/** @internal */39function positiveNumberToInt64(n: number): ArrayInt64['data'] {40 return [~~(n / 0x100000000), n >>> 0];41}42/** @internal */43function indexInDoubleFromDecomp(exponent: number, significand: number): ArrayInt64['data'] {44 // WARNING: significand >= 045 // By construct of significand in decomposeDouble,46 // significand is always max-ed.47 // The double close to zero are the only one having a significand <1, they also have an exponent of -1022.48 // They are in range: [2**(-1022) * 2**(-52), 2**(-1022) * (2 - 2 ** 52)]49 // In other words there are 2**53 elements in that range if we include zero.50 // All other ranges (other exponents) have a length of 2**52 elements.51 if (exponent === -1022) {52 // We want the significand to be an integer value (like an index)53 const rescaledSignificand = significand * 2 ** 52; // significand * 2**5254 return positiveNumberToInt64(rescaledSignificand);55 }56 // Offset due to exp = -1022 + Offset of previous exp (excl. -1022) + Offset in current exp57 // 2**53 + (exponent - (-1022) -1) * 2**52 + (significand - 1) * 2**5258 // (exponent + 1023) * 2**52 + (significand - 1) * 2**5259 const rescaledSignificand = (significand - 1) * 2 ** 52; // (significand-1) * 2**5260 const exponentOnlyHigh = (exponent + 1023) * 2 ** 20; // (exponent + 1023) * 2**52 => [high: (exponent + 1023) * 2**20, low: 0]61 const index = positiveNumberToInt64(rescaledSignificand);62 index[0] += exponentOnlyHigh;63 return index;64}65/**66 * Compute the index of d relative to other available 64-bit floating point numbers67 * Rq: Produces negative indexes for negative doubles68 *69 * @param d - 64-bit floating point number, anything except NaN70 *71 * @internal72 */73export function doubleToIndex(d: number): ArrayInt64 {74 if (d === safePositiveInfinity) {75 return clone64(INDEX_POSITIVE_INFINITY);76 }77 if (d === safeNegativeInfinity) {78 return clone64(INDEX_NEGATIVE_INFINITY);79 }80 const decomp = decomposeDouble(d);81 const exponent = decomp.exponent;82 const significand = decomp.significand;83 if (d > 0 || (d === 0 && 1 / d === safePositiveInfinity)) {84 return { sign: 1, data: indexInDoubleFromDecomp(exponent, significand) };85 } else {86 const indexOpposite = indexInDoubleFromDecomp(exponent, -significand);87 if (indexOpposite[1] === 0xffffffff) {88 indexOpposite[0] += 1;89 indexOpposite[1] = 0;90 } else {91 indexOpposite[1] += 1;92 }93 return { sign: -1, data: indexOpposite }; // -indexInDoubleFromDecomp(exponent, -significand) - 194 }...`

integrationTests.js

Source:integrationTests.js

`1export default function integrationTests(Hangul) {2 const a = Symbol('oneArgument');3 const typeDecorator = datum => ((typeof datum === 'object' || typeof datum === 'string')4 ? JSON.stringify(datum)5 : datum);6 const tests = {7 assemble: [8 ['ã±ãããããã£', 'ê³ ìì´'],9 [a, ['ã±', 'ã', 'ã', 'ã', 'ã', 'ã', 'ã£'], 'ê³ ìì´'],10 [a, ['ãã£ã±ããã·ã ããã±ã·ãããããã´ã£ã·ã'], 'ì´ê²ë ìëí©ëë¤'],11 ['Hello ããã´ã´ãã World ããããã', 'Hello ìë World ì¸ì'],12 ],13 composeComplex: [14 [['ã·', 'ã·'], 'ã¸'],15 [['ãã', 'ã'], 'ããã'],16 [['', 'ã'], 'ã'],17 [['ã¹', 'ã±', ''], 'ãº'],18 [['ã¹', 'ã±', true], 'ãºtrue'],19 [['ã¹', 'ã±', 1], 'ãº1'],20 // composition with different options21 [22 ['ãã', 'ã', '', { hardFail: true }],23 Error('is not a Character!'),24 ],25 [26 ['', 'ã', '', { hardFail: true }],27 Error('The first input to Hangul.composeComplex'),28 ],29 [30 ['ã·', 'ã·', 'ã', { hardFail: true }],31 Error('but cannot combine'),32 ],33 [34 ['ã', 'ã', 'ã·', {35 complex3: true,36 complexArchaic: true,37 }],38 'ãµ',39 ],40 // [['ã', 'ã', '', { complexJung: false }], 'ãã'],41 // [['ã±', 'ã±', '', { composeComplexDouble: false }], 'ã±ã±'],42 ],43 composeSyllable: [44 [['ã', 'ã£', 'ã'], 'ì§'],45 [['ã', 'ã', 'ã£'], 'ëª¨ã£'],46 [['ã', 'ã', 'ã£', { hardFail: true }], Error('')],47 [['ã', 'a'], 'ãa'],48 [['ã', 'a', '', { hardFail: true }], Error('is not a valid jung Character!')],49 [['ãã', 'ã·'], 'ããã·'],50 [['ã', 'ã'], 'ë¹ '],51 ],52 decomposeComplex: [53 ['ã¸', 'ã¸'],54 [['ã¸', { grouped: true }], 'ã¸'],55 [['ã¸', { decomposeDouble: true }], 'ã·ã·'],56 [['ã¸', { grouped: true, decomposeDouble: true }], 'ã·ã·'],57 [['', { grouped: true }], ''],58 ],59 decomposeSyllable: [60 ['ë¹ ', 'ãã'],61 ['ì', 'ããã'],62 ['ã', 'ã'],63 [['ã', { hardFail: true }], Error('is not a syllable!')],64 ],65 disassemble: [66 ['ê³ ìì´', 'ã±ãããããã£'],67 [['ë¹ ë¥¸', { grouped: true }], [['ã', 'ã'], ['ã¹', 'ã¡', 'ã´']]],68 [['ìë¤', { grouped: true }], [['ã', 'ã', ['ã', 'ã']], ['ã·', 'ã']]],69 ['', ''],70 [['', { grouped: true }], []],71 ],72 disassembleCharacter: [73 ['ì', 'ãããã'],74 [['ì', { grouped: true }], ['ã', 'ã', ['ã', 'ã']]],75 ],76 stronger: [77 ['ã±', 'ã²'],78 ['ã', 'ã'],79 ['ã', 'ã²'],80 ['ã', 'ã'],81 ],82 hangulToKeys: [83 ['ê³ ìì´', 'rhdiddl'],84 [['ë¹ ë¥¸', { grouped: true }], [['Q', 'k'], ['f', 'm', 's']]],85 [['ìë¤', { grouped: true }], [['d', 'j', ['q', 't']], ['e', 'k']]],86 ['', ''],87 [['', { grouped: true }], []],88 ],89 keysToHangul: [90 ['qwerty', 'ããã·ã³ã'],91 [a, ['qwer', 'ty'], 'ããã·ã±ì¼'],92 ],93 };94 Object.keys(tests).forEach((functionName) => {95 const pairs = tests[functionName];96 describe(`Hangul.\${functionName}`, () => {97 const fn = Hangul[functionName];98 if (!fn) {99 throw Hangul;100 }101 pairs.forEach((en) => {102 let args;103 let res;104 if (en[0] === a) {105 args = [en[1]];106 [, , res] = en;107 } else if (Array.isArray(en[0])) {108 [args, res] = en;109 } else {110 args = [en[0]];111 [, res] = en;112 }113 const stargs = args.map(typeDecorator).join(', ');114 if (res instanceof Error) {115 const { message } = res;116 test(`\${stargs} throws "\${message}"`, () => {117 expect(() => fn(...args)).toThrow(message);118 });119 } else if (res instanceof Object) {120 test(`\${(stargs)} => \${typeDecorator(res)}`, () => {121 expect(fn(...args)).toEqual(res);122 });123 } else if (Array.isArray(en)) {124 test(`\${(stargs)} => \${typeDecorator(res)}`, () => {125 expect(fn(...args)).toBe(res);126 });127 }128 });129 });130 });131 // I'm not gonna test the hangul block things because I'm lazy...`

Using AI Code Generation

`1const { decomposeDouble } = require('fast-check');2const [sign, exponent, significand] = decomposeDouble(0.1);3console.log(sign, exponent, significand);4const { decomposeDouble } = require('fast-check');5const [sign, exponent, significand] = decomposeDouble(0.1);6console.log(sign, exponent, significand);7const { decomposeDouble } = require('fast-check');8const [sign, exponent, significand] = decomposeDouble(0.1);9console.log(sign, exponent, significand);10const { decomposeDouble } = require('fast-check');11const [sign, exponent, significand] = decomposeDouble(0.1);12console.log(sign, exponent, significand);13const { decomposeDouble } = require('fast-check');14const [sign, exponent, significand] = decomposeDouble(0.1);15console.log(sign, exponent, significand);16const { decomposeDouble } = require('fast-check');17const [sign, exponent, significand] = decomposeDouble(0.1);18console.log(sign, exponent, significand);19const { decomposeDouble } = require('fast-check');20const [sign, exponent, significand] = decomposeDouble(0.1);21console.log(sign, exponent, significand);22const { decomposeDouble } = require('fast-check');23const [sign, exponent, significand] = decomposeDouble(0.1);24console.log(sign, exponent, significand);25const { decomposeDouble } = require('fast`

Using AI Code Generation

`1const fc = require('fast-check');2const {decomposeDouble} = require('fast-check/lib/types/DoubleArbitrary');3const {double} = require('fast-check/lib/types/DoubleArbitrary');4const {doubleNext} = require('fast-check/lib/types/DoubleArbitrary');5const {doubleNextWithin} = require('fast-check/lib/types/DoubleArbitrary');6const {doubleNextArbitrary} = require('fast-check/lib/types/DoubleArbitrary');7const {doubleNextArbitraryWithin} = require('fast-check/lib/types/DoubleArbitrary');8const {doubleNextArbitraryWithinArbitrary} = require('fast-check/lib/types/DoubleArbitrary');9const {doubleNextArbitraryWithinArbitraryNext} = require('fast-check/lib/types/DoubleArbitrary');10const {doubleNextArbitraryWithinArbitraryNextWithin} = require('fast-check/lib/types/DoubleArbitrary');11const {doubleNextArbitraryWithinArbitraryNextWithinArbitrary} = require('fast-check/lib/types/DoubleArbitrary');12const {doubleNextArbitraryWithinArbitraryNextWithinArbitraryNext} = require('fast-check/lib/types/DoubleArbitrary');13const {doubleNextArbitraryWithinArbitraryNextWithinArbitraryNextWithin} = require('fast-check/lib/types/DoubleArbitrary');14const {doubleNextArbitraryWithinArbitraryNextWithinArbitraryNextWithinArbitrary} = require('fast-check/lib/types/DoubleArbitrary');15const {doubleNextArbitraryWithinArbitraryNextWithinArbitraryNextWithinArbitraryNext} = require('fast-check/lib/types/DoubleArbitrary');16const {doubleNextArbitraryWithinArbitraryNextWithinArbitraryNextWithinArbitraryNextWithin} = require('fast-check/lib/types/DoubleArbitrary');17const {doubleNextArbitraryWithinArbitraryNextWithinArbitraryNextWithinArbitraryNextWithinArbitrary} = require('fast-check/lib/types/DoubleArbitrary');18const {doubleNextArbitraryWithinArbitraryNextWithinArbitraryNextWithinArbitraryNextWithinArbitraryNext} = require('fast-check/lib/types/DoubleArbitrary');19const {doubleNextArbitraryWithinArbitraryNextWithinArbitraryNextWithinArbitraryNextWithinArbitraryNextWithin} = require('fast-check/lib/types/DoubleArbitrary');20const {doubleNextArbitraryWithinArbitraryNextWithinArbitraryNextWithinArbitraryNextWithinArbitraryNextWithinArbitrary} = require('fast-check/lib/types/`

Using AI Code Generation

`1const fc = require("fast-check");2const { decomposeDouble } = require("fast-check/lib/types/DoubleArbitrary.js");3console.log(decomposeDouble(2.5));4console.log(decomposeDouble(-2.5));5console.log(decomposeDouble(0.0));6console.log(decomposeDouble(-0.0));7console.log(decomposeDouble(1.0));8console.log(decomposeDouble(-1.0));9console.log(decomposeDouble(Infinity));10console.log(decomposeDouble(-Infinity));11console.log(decomposeDouble(NaN));`

Using AI Code Generation

`1const { decomposeDouble } = require("fast-check");2const test3 = () => {3 const decomposed = decomposeDouble(123.456);4 console.log(decomposed);5};6test3();7const { decomposeDouble } = require("./dist/lib/check/arbitrary/DoubleArbitrary");8const test4 = () => {9 const decomposed = decomposeDouble(123.456);10 console.log(decomposed);11};12test4();13const { decomposeDouble } = require("./dist/lib/check/arbitrary/DoubleArbitrary");14const test5 = () => {15 const decomposed = decomposeDouble(123.456);16 console.log(decomposed);17};18test5();`

Using AI Code Generation

`1const fc = require('fast-check');2const { decomposeDouble, recomposeDouble } = require('double-fp');3const double = 1.2345678901234567890123456789012345678901234567890123456789012345678901234567890123456789;4const { mantissa, exponent } = decomposeDouble(double);5console.log(`mantissa: \${mantissa}, exponent: \${exponent}`);6const recomposedDouble = recomposeDouble(mantissa, exponent);7console.log(`recomposed double: \${recomposedDouble}`);`

Using AI Code Generation

`1const fc = require ('fast-check');2const {decomposeDouble} = require ('./double-decomposer');3fc.assert(fc.property(fc.double(), (d) => {4 const {sign, exponent, significand} = decomposeDouble(d);5 const result = sign * Math.pow(2, exponent) * (1 + significand);6 return result === d;7}));8const fc = require ('fast-check');9const {decomposeDouble} = require ('./double-decomposer');10fc.assert(fc.property(fc.double(), (d) => {11 const {sign, exponent, significand} = decomposeDouble(d);12 const result = sign * Math.pow(2, exponent) * (1 + significand);13 return result === d;14}));15const fc = require ('fast-check');16const {decomposeDouble} = require ('./double-decomposer');17fc.assert(fc.property(fc.double(), (d) => {18 const {sign, exponent, significand} = decomposeDouble(d);19 const result = sign * Math.pow(2, exponent) * (1 + significand);20 return result === d;21}));22const fc = require ('fast-check');23const {decomposeDouble} = require ('./double-decomposer');24fc.assert(fc.property(fc.double(), (d) => {25 const {sign, exponent, significand} = decomposeDouble(d);26 const result = sign * Math.pow(2, exponent) * (1 + significand);27 return result === d;28}));29const fc = require ('fast-check');30const {decomposeDouble} = require ('./double-decomposer');31fc.assert(fc.property(fc.double(), (d) => {32 const {sign, exponent, significand} = decomposeDouble(d);33 const result = sign * Math.pow(2, exponent) * (1 +`

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