# How to use Sum method of example Package

Best Got code snippet using example.Sum

acc_test.go

Source:acc_test.go

`...13 fmt.Println("-1 negative: ", math.Signbit(-1))14 fmt.Println("AccSignBit 0: ", accsum.AccSignBit([]float64{0}))15 fmt.Println("AccSignBit -1: ", accsum.AccSignBit([]float64{-1}))16 p := []float64{1e20, -1, -1e20}17 fmt.Println("Signbit(Sum(p)):", math.Signbit(accsum.Sum(p)))18 p = []float64{1e20, -1, -1e20}19 fmt.Println("AccSignBit(p): ", accsum.AccSignBit(p))20 fmt.Println("p after AccSignBit:", p)21 // Output:22 // 0 negative: false23 // -1 negative: true24 // AccSignBit 0: false25 // AccSignBit -1: true26 // Signbit(Sum(p)): false27 // AccSignBit(p): true28}29*/30func ExampleAccSum() {31 n := 5432132 p := make([]float64, n+1)33 for i := range p {34 p[i] = float64(i)35 }36 p[0] = 1e2037 fmt.Printf("Simple: %.16e\n", accsum.Sum(p))38 fmt.Printf("AccSum: %.16e\n", accsum.AccSum(p))39 fmt.Println("Triangle: ", n*(n+1)/2)40 // Output:41 // Simple: 1.0000000000146203e+2042 // AccSum: 1.0000000000147541e+2043 // Triangle: 147541268144}45func ExampleAccSumHuge() {46 n := 5432147 p := make([]float64, n+1)48 for i := range p {49 p[i] = float64(i)50 }51 p[0] = 1e2052 fmt.Printf("Simple: %.16e\n", accsum.Sum(p))53 fmt.Printf("AccSumHuge: %.16e\n", accsum.AccSumHuge(p))54 fmt.Println("Triangle: ", n*(n+1)/2)55 // Output:56 // Simple: 1.0000000000146203e+2057 // AccSumHuge: 1.0000000000147541e+2058 // Triangle: 147541268159}60func ExampleAccSumK() {61 p := []float64{1e20, 1, 1, 1e20}62 r := accsum.AccSumK(p, 2)63 fmt.Println(r[0], "+", r[1])64 // Output:65 // 2e+20 + 266}67func ExampleDot2() {68 n := 432169 x := make([]float64, n+1)70 for i := range x {71 x[i] = float64(i)72 }73 x[0] = 1e1174 fmt.Printf("Simple: %.16e\n", accsum.Dot(x, x))75 fmt.Printf("Dot2: %.16e\n", accsum.Dot2(x, x))76 fmt.Println("Square triangle: ", n*(n+1)*(2*n+1)/6)77 // Output:78 // Simple: 1.0000000000026734e+2279 // Dot2: 1.0000000000026902e+2280 // Square triangle: 2690185896181}82func ExampleDot2Err() {83 n := 432184 x := make([]float64, n+1)85 for i := range x {86 x[i] = float64(i)87 }88 x[0] = 1e1189 fmt.Printf("Simple: %.16e\n", accsum.Dot(x, x))90 dot, err := accsum.Dot2Err(x, x)91 fmt.Printf("Dot2: %.16e\n", dot)92 fmt.Printf("Square triangle: %15d\n", n*(n+1)*(2*n+1)/6)93 fmt.Printf("Dot2Err: %15.0f\n", err)94 // Output:95 // Simple: 1.0000000000026734e+2296 // Dot2: 1.0000000000026902e+2297 // Square triangle: 2690185896198 // Dot2Err: 111022399}100func ExampleDotK() {101 n := 4321102 x := make([]float64, n+1)103 for i := range x {104 x[i] = float64(i)105 }106 x[0] = 1e11107 fmt.Printf("Simple: %.16e\n", accsum.Dot(x, x))108 fmt.Printf("DotK(K=3): %.16e\n", accsum.DotK(x, x, 2))109 fmt.Println("Square triangle: ", n*(n+1)*(2*n+1)/6)110 // Output:111 // Simple: 1.0000000000026734e+22112 // DotK(K=3): 1.0000000000026902e+22113 // Square triangle: 26901858961114}115func ExampleDownSum() {116 n := 12345117 p := make([]float64, n+1)118 for i := range p {119 p[i] = float64(i)120 }121 p[0] = 1e19122 u := accsum.DownSum(p)123 fmt.Println("Triangle: ", n*(n+1)/2)124 fmt.Printf("DownSum: %.16e\n", u)125 fmt.Printf("Next above: %.16e\n\n", math.Nextafter(u, math.Inf(1)))126 n = 54321127 p = make([]float64, n+1)128 for i := range p {129 p[i] = float64(i)130 }131 p[0] = 1e20132 u = accsum.DownSum(p)133 fmt.Println("Triangle: ", n*(n+1)/2)134 fmt.Printf("DownSum: %.16e\n", u)135 fmt.Printf("Next above: %.16e\n", math.Nextafter(u, math.Inf(1)))136 // Output:137 // Triangle: 76205685138 // DownSum: 1.0000000000076204e+19139 // Next above: 1.0000000000076206e+19140 //141 // Triangle: 1475412681142 // DownSum: 1.0000000000147541e+20143 // Next above: 1.0000000000147543e+20144}145func ExampleFastTwoSum() {146 a, b := .2, .1147 x, y := accsum.FastTwoSum(a, b)148 fmt.Printf("a: % .20f\n", a)149 fmt.Printf("b: % .20f\n", b)150 fmt.Printf("x: % .20f\n", x)151 fmt.Printf("y: % .20f\n", y)152 // Output:153 // a: 0.20000000000000001110154 // b: 0.10000000000000000555155 // x: 0.30000000000000004441156 // y: -0.00000000000000002776157}158func ExampleGenDot() {159 rand.Seed(42)160 x, y, d, c := accsum.GenDot(6, 1e31)161 fmt.Println("+x y")162 for i, xi := range x {163 fmt.Printf("%+.2e %+.2e\n", xi, y[i])164 }165 fmt.Println()166 fmt.Printf("condition: %.2e\n", c)167 fmt.Printf("dot exact: % .6f\n", d)168 fmt.Printf("Dot2(x,y): % .6f\n", accsum.Dot2(x, y))169 fmt.Printf("Dot(x,y): % .2e\n", accsum.Dot(x, y))170 // Output:171 // +x y172 // -3.91e+15 +9.38e+14173 // -5.20e+14 -7.04e+15174 // -5.64e-01 +5.61e+07175 // -3.05e+05 -4.78e+05176 // -2.34e-01 +6.26e-01177 // +1.96e+07 +4.90e+07178 //179 // condition: 5.30e+31180 // dot exact: -0.276634181 // Dot2(x,y): -0.250000182 // Dot(x,y): 3.99e+14183}184func ExampleNearSum() {185 n := 12345186 p := make([]float64, n+1)187 for i := range p {188 p[i] = float64(i)189 }190 p[0] = 1e19191 u := accsum.NearSum(p)192 fmt.Println("Triangle: ", n*(n+1)/2)193 fmt.Printf("NearSum: %.16e\n\n", u)194 n = 54321195 p = make([]float64, n+1)196 for i := range p {197 p[i] = float64(i)198 }199 p[0] = 1e20200 u = accsum.NearSum(p)201 fmt.Println("Triangle: ", n*(n+1)/2)202 fmt.Printf("NearSum: %.16e\n", u)203 // Output:204 // Triangle: 76205685205 // NearSum: 1.0000000000076206e+19206 //207 // Triangle: 1475412681208 // NearSum: 1.0000000000147541e+20209}210func ExamplePrecSum() {211 n := 54321212 p := make([]float64, n+1)213 for i := range p {214 p[i] = float64(i)215 }216 p[0] = 1e20217 s := 0.218 for _, x := range p {219 s += x220 }221 fmt.Printf("Simple: %.16e\n", s)222 fmt.Printf("PrecSum: %.16e\n", accsum.PrecSum(p, 2))223 fmt.Println("Triangle: ", n*(n+1)/2)224 // Output:225 // Simple: 1.0000000000146203e+20226 // PrecSum: 1.0000000000147541e+20227 // Triangle: 1475412681228}229func ExampleSum2() {230 n := 54321231 p := make([]float64, n+1)232 for i := range p {233 p[i] = float64(i)234 }235 p[0] = 1e20236 fmt.Printf("Simple: %.16e\n", accsum.Sum(p))237 fmt.Printf("Sum2: %.16e\n", accsum.Sum2(p))238 fmt.Println("Triangle: ", n*(n+1)/2)239 // Output:240 // Simple: 1.0000000000146203e+20241 // Sum2: 1.0000000000147541e+20242 // Triangle: 1475412681243}244func ExampleSumK() {245 n := 54321246 p := make([]float64, n+1)247 for i := range p {248 p[i] = float64(i)249 }250 p[0] = 1e20251 fmt.Printf("Simple: %.16e\n", accsum.Sum(p))252 fmt.Printf("SumK: %.16e\n", accsum.SumK(p, 2))253 fmt.Println("Triangle: ", n*(n+1)/2)254 // Output:255 // Simple: 1.0000000000146203e+20256 // SumK: 1.0000000000147541e+20257 // Triangle: 1475412681258}259func ExampleSumKVert() {260 n := 54321261 p := make([]float64, n+1)262 for i := range p {263 p[i] = float64(i)264 }265 p[0] = 1e20266 fmt.Printf("Simple: %.16e\n", accsum.Sum(p))267 fmt.Printf("SumKVert: %.16e\n", accsum.SumKVert(p, 2))268 fmt.Println("Triangle: ", n*(n+1)/2)269 // Output:270 // Simple: 1.0000000000146203e+20271 // SumKVert: 1.0000000000147541e+20272 // Triangle: 1475412681273}274func ExampleTwoProduct() {275 a := 1e10 + 1276 b := 1e6 + 1277 fmt.Println(accsum.TwoProduct(a, b))278 // Output: 1.0000010001e+16 1279}280func ExampleTwoSum() {281 a, b := .1, .2282 x, y := accsum.TwoSum(a, b)283 fmt.Printf("a: % .20f\n", a)284 fmt.Printf("b: % .20f\n", b)285 fmt.Printf("x: % .20f\n", x)286 fmt.Printf("y: % .20f\n", y)287 // Output:288 // a: 0.10000000000000000555289 // b: 0.20000000000000001110290 // x: 0.30000000000000004441291 // y: -0.00000000000000002776292}293func ExampleUpSum() {294 n := 12345295 p := make([]float64, n+1)296 for i := range p {297 p[i] = float64(i)298 }299 p[0] = 1e19300 u := accsum.UpSum(p)301 fmt.Println("Triangle: ", n*(n+1)/2)302 fmt.Printf("UpSum: %.16e\n", u)303 fmt.Printf("Next lower: %.16e\n\n", math.Nextafter(u, math.Inf(-1)))304 n = 54321305 p = make([]float64, n+1)306 for i := range p {307 p[i] = float64(i)308 }309 p[0] = 1e20310 u = accsum.UpSum(p)311 fmt.Println("Triangle: ", n*(n+1)/2)312 fmt.Printf("UpSum: %.16e\n", u)313 fmt.Printf("Next lower: %.16e\n", math.Nextafter(u, math.Inf(-1)))314 // Output:315 // Triangle: 76205685316 // UpSum: 1.0000000000076206e+19317 // Next lower: 1.0000000000076204e+19318 //319 // Triangle: 1475412681320 // UpSum: 1.0000000000147543e+20321 // Next lower: 1.0000000000147541e+20322}...`

digest_test.go

Source:digest_test.go

`...27 </div>28 </body>29</html>30`31 expectedExampleSum = `[DOCTYPE:html-][:html-[:head-[:title-][:meta-:charset][:meta-:content(text/html; charset=utf-8),:http-equiv(Content-type)][:meta-:content(width=device-width, initial-scale=1),:name(viewport)][:style-:type(text/css)]][:body-[:div-[:h1-][:p-][:p-[:a-:href(/path/to/link-to1)]][:p-[:a-:href(/path/to/link-to2)]]]]]`32 expectedExampleSum32 = 99307048133)34func getSumRawText(rootNode *html.Node) (string, error) {35 buf := &bytes.Buffer{}36 c := &ctx{37 writer: buf,38 ignoreFunc: nopIgnoreFunc,39 }40 err := c.sum(rootNode)41 if err != nil {42 return "", nil43 }44 return buf.String(), nil45}46func getCrc32Sum(rootNode *html.Node) (uint32, error) {47 h := NewHash(func() hash.Hash {48 return crc32.NewIEEE()49 })50 crcSum, err := h.Sum(rootNode)51 if err != nil {52 return 0, err53 }54 crcSum32 := uint32(crcSum[0])<<24 | uint32(crcSum[1])<<16 | uint32(crcSum[2])<<8 | uint32(crcSum[3])55 return crcSum32, nil56}57func TestRawSum(t *testing.T) {58 t.Run("Simple", func(t *testing.T) {59 rootNode, err := html.Parse(strings.NewReader(exampleHTML))60 if err != nil {61 t.Fatal(err)62 }63 rawSum, err := getSumRawText(rootNode)64 if err != nil {65 t.Fatal(err)66 }67 if rawSum != expectedExampleSum {68 t.Errorf("Unexpected sum: %s", rawSum)69 }70 })71 t.Run("Modified", func(t *testing.T) {72 t.Run("NonBroken", func(t *testing.T) {73 r := strings.NewReplacer(`href=`, `HREF=`, `<h1>`, `<H1 title="hello">`)74 rootNode, err := html.Parse(strings.NewReader(r.Replace(exampleHTML)))75 if err != nil {76 t.Fatal(err)77 }78 rawSum, err := getSumRawText(rootNode)79 if err != nil {80 t.Fatal(err)81 }82 if rawSum != expectedExampleSum {83 t.Errorf("Unexpected sum: %s", rawSum)84 }85 })86 t.Run("Broken", func(t *testing.T) {87 r := strings.NewReplacer(`href="/path/to/link-to2"`, `HREF="/path/to/link-to3"`, `<h1>`, `<H2>`)88 rootNode, err := html.Parse(strings.NewReader(r.Replace(exampleHTML)))89 if err != nil {90 t.Fatal(err)91 }92 rawSum, err := getSumRawText(rootNode)93 if err != nil {94 t.Fatal(err)95 }96 if rawSum == expectedExampleSum {97 t.Errorf("Unexpected sum: %s", rawSum)98 }99 t.Logf("raw: %s", rawSum)100 })101 })102}103func TestDigest(t *testing.T) {104 t.Run("Reverse", func(t *testing.T) {105 rootNode, err := html.Parse(strings.NewReader(exampleHTML))106 if err != nil {107 t.Fatal(err)108 }109 rawSum, err := getSumRawText(rootNode)110 if err != nil {111 t.Fatal(err)112 }113 crcSum32, err := getCrc32Sum(rootNode)114 if err != nil {115 t.Fatal(err)116 }117 if recalced := crc32.ChecksumIEEE([]byte(rawSum)); crcSum32 != recalced {118 t.Errorf("Unexpected sum: %d, expected: %d", crcSum32, recalced)119 }120 })121 t.Run("Simple", func(t *testing.T) {122 rootNode, err := html.Parse(strings.NewReader(exampleHTML))123 if err != nil {124 t.Fatal(err)125 }126 crcSum32, err := getCrc32Sum(rootNode)127 if err != nil {128 t.Fatal(err)129 }130 if crcSum32 != expectedExampleSum32 {131 t.Errorf("Unexpected sum: %d", crcSum32)132 }133 })134 t.Run("Modified", func(t *testing.T) {135 t.Run("NonBroken", func(t *testing.T) {136 r := strings.NewReplacer(`href=`, `HREF=`, `<h1>`, `<H1 title="hello">`)137 rootNode, err := html.Parse(strings.NewReader(r.Replace(exampleHTML)))138 if err != nil {139 t.Fatal(err)140 }141 crcSum32, err := getCrc32Sum(rootNode)142 if err != nil {143 t.Fatal(err)144 }145 if crcSum32 != expectedExampleSum32 {146 t.Errorf("Unexpected sum: %d", crcSum32)147 }148 })149 t.Run("Broken", func(t *testing.T) {150 r := strings.NewReplacer(`href="/path/to/link-to2"`, `HREF="/path/to/link-to3"`, `<h1>`, `<H2>`)151 rootNode, err := html.Parse(strings.NewReader(r.Replace(exampleHTML)))152 if err != nil {153 t.Fatal(err)154 }155 crcSum32, err := getCrc32Sum(rootNode)156 if err != nil {157 t.Fatal(err)158 }159 if crcSum32 == expectedExampleSum32 {160 t.Errorf("Unexpected sum: %d", crcSum32)161 }162 t.Logf("crc32: %d", crcSum32)163 })164 })165}...`

examples_test.go

Source:examples_test.go

`...15 "fmt"16 "os"17 "os/exec"18)19func ExampleWhatIsAGeneric_SumInt() {20 fmt.Println(SumInt(1, 2, 3))21 // Output: 622}23func ExampleWhatIsAGeneric_EmptyInterface() {24 print := func(i interface{}, err error) {25 if err != nil {26 fmt.Println(err)27 } else {28 fmt.Println(i)29 }30 }31 print(SumInterface(int64(1), int64(2), int64(3)))32 print(SumInterface(uint32(1), int(2), uint32(3)))33 print(SumInterface(float64(1), int(2), uint32(3)))34 print(SumInterface(uint32(1), uint32(2), uint32(3)))35 // Output:36 // 637 // int is not supported38 // float64 is not supported39 // 640}41func ExampleWhatIsAGeneric_MultipleFunctions() {42 fmt.Println(SumInt64(1, 2, 3))43 fmt.Println(SumUint32(1, 2, 3))44 // Output:45 // 646 // 647}48func ExampleSyntax() {49 fmt.Println(SumTint(1, 2, 3))50 // Output: 651}52func ExampleConstraints() {53 fmt.Println(SumTintOrint64(1, 2, 3))54 fmt.Println(SumTintOrint64(int64(1), 2, 3))55 // Output:56 // 657 // 658}59func ExampleTheAnyConstraint() {60 cmd := exec.Command(61 "go",62 "build",63 /*64 The `go build` command below uses the flag `-tags invalid`. This65 flag instructs Go to include the file66 `./examples/04-the-any-constraint/main.go` in the compilation.67 Normally the file has a build constraint that prevents it from being68 considered to prevent:69 * Dev tools (ex. an IDE such as VS Code) from constantly warning70 this file is in error71 * a failed `go test ./...` command from the root of this72 repository73 However, the entire point of this example is to demonstrate that74 failure, so the file needs to be "activated."75 */76 "-tags", "invalid",77 "./examples/04-the-any-constraint/",78 )79 cmd.Stdout = os.Stdout80 cmd.Stderr = os.Stdout81 fmt.Println(cmd.Run())82 // Output:83 // # go-generics-the-hard-way/03-getting-started/examples/04-the-any-constraint84 // examples/04-the-any-constraint/main.go:30:3: invalid operation: operator + not defined on sum (variable of type T constrained by any)85 // exit status 286}87// SumInt returns the sum of the provided arguments.88func SumInt(args ...int) int {89 var sum int90 for i := 0; i < len(args); i++ {91 sum += args[i]92 }93 return sum94}95// SumInterface returns the sum of the provided arguments.96//97// An error is returned if the arguments are not of a supported98// type or of mixed types.99func SumInterface(args ...interface{}) (interface{}, error) {100 var sum interface{}101 for i := 0; i < len(args); i++ {102 switch a := args[i].(type) {103 case int64:104 if sum == nil {105 sum = int64(0)106 }107 tsum, ok := sum.(int64)108 if !ok {109 return nil, fmt.Errorf("previous arg was not an int64")110 }111 tsum += a112 sum = tsum113 case uint32:114 if sum == nil {115 sum = uint32(0)116 }117 tsum, ok := sum.(uint32)118 if !ok {119 return nil, fmt.Errorf("previous arg was not an uint32")120 }121 tsum += a122 sum = tsum123 default:124 return nil, fmt.Errorf("%T is not supported", args[i])125 }126 }127 return sum, nil128}129// SumInt64 returns the sum of the provided int64 values.130func SumInt64(args ...int64) int64 {131 var sum int64132 for i := 0; i < len(args); i++ {133 sum += args[i]134 }135 return sum136}137// SumUint32 returns the sum of the provided uint32 values.138func SumUint32(args ...uint32) uint32 {139 var sum uint32140 for i := 0; i < len(args); i++ {141 sum += args[i]142 }143 return sum144}145// SumTint returns the sum of the provided arguments.146func SumTint[T int](args ...T) T {147 var sum T148 for i := 0; i < len(args); i++ {149 sum += args[i]150 }151 return sum152}153// SumTintOrint64 returns the sum of the provided arguments.154func SumTintOrint64[T int | int64](args ...T) T {155 var sum T156 for i := 0; i < len(args); i++ {157 sum += args[i]158 }159 return sum160}...`

Sum

Using AI Code Generation

`1import "fmt"2type Example struct {3}4func (e *Example) Sum() int {5}6func main() {7 e := Example{10, 20}8 fmt.Println(e.Sum())9}`

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