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  • collection function _ golang

    We often need our programs to perform operations on collection of data, like selecting all items that satisfy a given predicate or mapping all items to a new collection with a custom function.

    package main
    
    import (
        "fmt"
        "strings"
    )
    
    func Index(vs []string, t string) int {
        for i, v := range vs {
            if v == t {
                return i
            }
        }
        return -1
    }
    
    func Include(vs []string, t string) bool {
        return Index(vs, t) >= 0
    }
    
    func Any(vs []string, f func(string) bool) bool {
        for _, v := range vs {
            if f(v) {
                return true
            }
        }
        return false
    }
    
    func All(vs []string, f func(string) bool) bool {
        for _, v := range vs {
            if !f(v) {
                return false
            }
        }
        return true
    }
    
    func Filter(vs []string, f func(string) bool) []string {
        vsf := make([]string, 0)
        for _, v := range vs {
            if f(v) {
                vsf = append(vsf, v)
            }
        }
        return vsf
    }
    
    func Map(vs []string, f func(string) string) []string {
        vsm := make([]string, len(vs))
        for i, v := range vs {
            vsm[i] = f(v)
        }
        return vsm
    }
    
    func main() {
        var strs = []string{"peach", "apple", "pear", "plum"}
        fmt.Println(Index(strs, "pear"))
        fmt.Println(Include(strs, "grape"))
        fmt.Println(Any(strs, func(v string) bool {
            return strings.HasPrefix(v, "p")
        }))
        fmt.Println(All(strs, func(v string) bool {
            return strings.HasPrefix(v, "p")
        }))
        fmt.Println(Filter(strs, func(v string) bool {
            return strings.Contains(v, "e")
        }))
        fmt.Println(Map(strs, strings.ToUpper))
    }
    2
    false
    true
    false
    [peach apple pear]
    [PEACH APPLE PEAR PLUM]

    总结 :

      1 : ...

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  • 原文地址:https://www.cnblogs.com/jackkiexu/p/4359666.html
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