30秒学会 Golang 片段 – None

Returns true if no elements in the collection pass the test implemented by the provided function, false otherwise.

Implement an appropriate function for each type.
Use range to iterate over elements in the given collection, returning true or false based on the result of fn.
The functions can be tweaked to allow for an index to be passed to fn as a second argument, if desired.

代码实现

func NoneInt(arr []int, fn func(int) bool) bool {
    for _, v := range arr {
        if fn(v) {
            return false
        }
    }
    return true
}
func NoneFloat64(arr []float64, fn func(float64) bool) bool {
    for _, v := range arr {
        if fn(v) {
            return false
        }
    }
    return true
}
func NoneBool(arr []bool, fn func(bool) bool) bool {
    for _, v := range arr {
        if fn(v) {
            return false
        }
    }
    return true
}
func NoneString(arr []string, fn func(string) bool) bool {
    for _, v := range arr {
        if fn(v) {
            return false
        }
    }
    return true
}

使用样例

intCheck := func(x int) bool { return x > 1 }
NoneInt([]int{0, -1}, intCheck) // true
float64Check := func(x float64) bool { return x > 0.5 }
NoneFloat64([]float64{0.4, 0.1}, float64Check) // true
boolCheck := func(x bool) bool { return x }
NoneBool([]bool{false, false}, boolCheck) // true
stringCheck := func(x string) bool { return len(x) > 1 }
NoneString([]string{"g", "h"}, stringCheck) // true