Example code for Go generics

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mattn
Long-time Golang user&contributor, Google Dev Expert for Go, and author of many Go tools, Vim plugin author. Windows hacker C#/Java/C/C++
mattn
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  • Set rand.Seed to shuffle makes other results in every runtime

    Set rand.Seed to shuffle makes other results in every runtime

    Before

    $ ./shuffle
    [5 9 3 6 4 10 1 8 7 2]
    $ ./shuffle
    [5 9 3 6 4 10 1 8 7 2]
    $ ./shuffle
    [5 9 3 6 4 10 1 8 7 2]
    $ ./shuffle
    [5 9 3 6 4 10 1 8 7 2]
    

    After

    $ ./shuffle
    [2 9 8 7 3 4 1 5 10 6]
    $ ./shuffle
    [2 1 10 9 4 5 3 7 8 6]
    $ ./shuffle
    [8 4 6 1 3 10 5 9 2 7]
    $ ./shuffle
    [8 5 2 7 1 10 6 4 9 3]
    

    I have tested rand.Shuffle, it makes same results in every runtime when without setting seed, so if current behavior is intentional, please just close this PR 🙏 https://golang.org/pkg/math/rand/#Shuffle

  • Fix dependent Go version to 1.17+

    Fix dependent Go version to 1.17+

    Using docker container run --volume="$(pwd)/:/usr/src" --workdir='/usr/src/' -it 'golang:latest' '/bin/bash'

    $ go version
    go version go1.16.2 linux/amd64
    $ cd add
    $ go build -gcflags=-G=3
    flag provided but not defined: -G
    

    Using built Go from current master

    $ /Users/kachick/repos/go/bin/go version
    go version devel +e0fae78e1d Sat Mar 20 17:08:03 2021 +0000 darwin/amd64
    $ cd add
    $ /Users/kachick/repos/go/bin/go build -gcflags=-G=3
    $ ls
    add     main.go
    

    So can we use generics from 1.17? 🤔

  • add

    add "some" and "every"

    I wanted to try my hand at Go generics and find myself using these function often to assert if every value or some values of a slice match a predicate.

  • Replace type lists with type sets

    Replace type lists with type sets

    Replaces type lists with type sets: https://github.com/golang/go/issues/45346

    Type lists produce compiler errors with the latest gotip: use generalized embedding syntax instead of a type list

  • Ternaryop and Normal Order Evaluation

    Ternaryop and Normal Order Evaluation

    Normal Order Evaluation is an evaluation strategy in which an expression is evaluated by repeatedly evaluating its leftmost outermost reducible expression. This means that a function's arguments are not evaluated before the function is applied.

    In a word, left or right value should be evaluated when it is applied

    So this code should be some kind of the following form:

    package main
    
    import (
    	"fmt"
    )
    
    func ternaryOp[T any](s bool, t func() T, f func() T) T {
    	if s {
    		return t()
    	}
    	return f()
    }
    
    func main() {
    	fmt.Println(ternaryOp(4 < 5, func() string {
    		fmt.Println("left evaluated")
    		return "less"
    	}, func() string {
    		fmt.Println("right evaluated")
    		return "greater"
    	}))
    }
    
    
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