javascript - JS中是否有相当于 "Array.None"的东西？

Question

LINQ 有一个类似的问题:Is there an equivalent of None() in LINQ?
集合/数组上有一些 bool 方法:

Array.some (类似于 linq.Any )

Array.every (类似于 linq.All )

我可以检查数组中是否没有元素与给定的函数回调匹配吗
一个可能的解决方法是 .filter然后检查 .length并确保它为零:

let arr = ["a","b","c"]
// make sure that no item in array = "b"
let noBs = arr.filter(el => el === "b").length === 0

Answer 1

正如 linq 示例在逻辑上得出的结论

None is the same as !Any, so you could define your own extension method as follows:

let none = (arr, callback) => !arr.some(callback)

然后像这样调用:

let arr = ["a","b","c"]
let noBs = none(arr, el => el === "b")

或者如果你想 extend Array.proto ，可以添加以下方法:

Object.defineProperty(Array.prototype, 'none', {
    value: function (callback) { return !this.some(callback) }
});

然后像这样调用:

let arr = ["a","b","c"]
let noBs = arr.none(el => el === "b")