8000 Added code for a new module which teaches generics: create_generics · anarchymonkey/learn_golang@8232750 · GitHub
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Added code for a new module which teaches generics: create_generics
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6 files changed

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‎create_generics/generics/generics.go

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package main
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import (
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"fmt"
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"batsy.com/utils"
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)
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func main() {
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fmt.Println("This is a simple example of a generics module")
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integerValues := map[string]int{
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"first": 100,
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"second": 200,
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}
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floatingValues := map[string]float64{
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"first": 100.20,
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"second": 200.80,
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}
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// fmt.Println("as we can see that we need to make a lot of functions to get the same summation of numbers")
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// fmt.Println(utils.SumOfNIntegers(integerValues))
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// fmt.Println(utils.SumOfNFloats(floatingValues))
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fmt.Println("Now by using generics we can use the same function for the calculation of every number")
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fmt.Println(utils.SumOfNNumbers(integerValues))
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fmt.Println(utils.SumOfNNumbers(floatingValues))
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}

‎create_generics/generics/go.mod

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module anarchymonkey.com/generics
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go 1.20
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replace batsy.com/utils => ../utils
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require batsy.com/utils v0.0.0-00010101000000-000000000000

‎create_generics/go.work

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go 1.20
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use (
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./generics
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./utils
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)

‎create_generics/utils/go.mod

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module batsy.com/utils
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go 1.20

‎create_generics/utils/utils.go

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package utils
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func SumOfNIntegers(numbers map[string]int) int {
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var sum int = 0
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for _, num := range numbers {
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sum += num
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}
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return sum
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}
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func SumOfNFloats(numbers map[string]float64) float64 {
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var sum float64 = 0.00
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for _, num := range numbers {
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sum += num
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}
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return sum
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}
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func SumOfNNumbers[K comparable, V int | float64](m map[K]V) V {
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var s V
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for _, v := range m {
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s += v
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}
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return s
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}

‎create_generics/utils/utils_test.go

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package utils
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import (
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"log"
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"testing"
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)
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func TestSumOfNIntegers(t *testing.T) {
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integerNumbers := map[string]int{
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"first": 10,
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"second": 20,
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}
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actual_result := SumOfNIntegers(integerNumbers)
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expected_result := 30
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if actual_result != expected_result {
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log.Fatalf("Some error occured, wrong result")
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}
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}
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func TestSumOfNFloats(t *testing.T) {
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var floatingNumbers map[string]float64 = map[string]float64{
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"first": 10.01,
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"second": 20.09,
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}
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actual_result := SumOfNFloats(floatingNumbers)
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expected_result := 30.10
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if actual_result != expected_result {
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log.Fatalf("Floating number results do not match")
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}
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}
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func TestSumOfNNumbers(t *testing.T) {
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integerNumbers := map[string]int{
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"first": 10,
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"second": 20,
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}
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actual_result := SumOfNNumbers(integerNumbers)
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expected_result := 30
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if actual_result != expected_result {
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log.Fatal("The results do not match")
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}
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}

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