It was always complicated to flatten an array in JS. Not anymore! ES2019 introduced a new method that flattens arrays with Array.flat()...
console.log(arr.flat()); // 输出 [1, 2, 'a', Array(1), 'c'] ——— depth 默认值为1 console.log(arr); // 输出 [1, 2, Array(3)] ——— 不会改变原数组 const arr = [1, 2, ['a', ['b'], 'c']]; console.log(arr.flat('abc')); // 输出 [1, 2, Array(3)] ...
Array.prototype.flat()method is used to flat arrays with more than one level depth by passing the depth level as an argument. In case we do not know the exact depth level, we can passInfinityas an argument to the function. vararray3=['element 0',[['element 1'],['element 2']],[...
掌握JavaScript 原生 057: 数组 Array 实例方法 Array.prototype.flatMap() 给定回调函数,然后将结果在展开一级。, 视频播放量 3、弹幕量 0、点赞数 1、投硬币枚数 2、收藏人数 1、转发人数 0, 视频作者 江山3D编程, 作者简介 精通基础,其余自通。 js基础-canvas-webgl-re
flat() is a new array instance method that can create a one-dimensional array from a multidimensional array.Example:['Dog', ['Sheep', 'Wolf']].flat() //[ 'Dog', 'Sheep', 'Wolf' ] By default it only “flats” up to one level....
const nestedArray = [['👍', '🐍'], ['👎', '🐘'], ['👏', '➡']]; const flatArray = [].concat(...nestedArray); console.log(flatArray) // [ '👍', '🐍', '👎', '🐘', '👏', '➡' ] Hey, if you've found this useful, please share the post to hel...
js array flat all in one array flat flatMap flatMap > flat + map https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flatMap varnew_array = arr.flatMap(functioncallback(currentValue[, index[, array]]) {// return element for new_array}[, thisArg]) ...
Theflat()method concatenates sub-array elements. See Also: The Array map() Method The Array flatMap() Method The Array filter() Method The Array forEach() Method Syntax array.flat(depth) Parameters ParameterDescription depthOptional. How deep a nested array should be flattened. ...
js array flat all in one array flat flatMap flatMap > flat + map var new_array = arr.flatMap(function callback(currentValue[, index[, array]]) { // return element for new_array }[, thisArg]) 1. 2. 3. flat var newArray = arr.flat([depth]); ...
事例地址:https://jsfiddle.net/dmitri_pavlutin/j945qunz/ 通过只使用 numbers.flatMap(),你可以将一个数组映射到另一个数组,但也可以从映射中跳过某些元素。 接着,我们来更详细地看看 array.flatMap()是如何工作的。 2. array.flatMap() array.flatMap() 函数接受一个回调函数作为参数并返回一个新的映射...