6、Array.reduce(浅拷贝) 其实用reduce来拷贝数组并没有展示出它的实际功能,但是我们还是要将其能够拷贝数组的能力说一下的 numbers = [1,2,3]; numbersCopy = numbers.reduce((newArray, element) =>{ newArray.push(element);returnnewArray; }, []); reduce()方法对数组中的每个元素执行一个由您提供...
In Javascript, deep-copy techniques depend on the elements in an array. Let's start there. Three types of elements Elements can be: literal values, literal structures, or prototypes. // Literal values (type1) const booleanLiteral = true; const numberLiteral = 1; const stringLiteral = 'true...
1. 使用...扩展运算符 const cloneArrayBySpreadOperator = (arr)=>{ return [...arr]; } 2. 使用from方法 const cloneArrayByArrayFrom = (arr)=>{ return Array.from(arr) } 3. 使用slice方式 const cloneArrayBySlice = (arr)=>{ return arr.slice() } 4. 使用map方法 const cloneArrayByMap ...
To create a brand new copy of an array in its entirety, you can useArray.slice()with no arguments. varsandwichesCopy=sandwiches.slice(); The fancy new ES6 way# If you only need to copy an array, you can use theArray.from()method we talked about yesterday. ...
An alternative way to think of it is this. The source array one is a large stack of papers stapled together. The source array two is also another large stack of papers. Would it be faster for you to Go to the store, buy enough paper needed for a copy of each source array. Then pu...
浅拷贝：创建一个新的对象，来接受重新复制或引用的对象值。如果对象属性是基本的数据类型，复制的就是...
10.copyWinthin()方法浅复制数组的一部分到同一数组中的另一个位置,并返回它,不会改变原数组的长度。 arr.copyWithin(target[, start[, end]]) vararray1 = ['a', 'b', 'c', 'd', 'e']; console.log(array1.copyWithin(0, 3, 4));//["d", "b", "c", "d", "e"] ...
const array1=['a','b','c','d','e'];//copy to index0the element at index3console.log(array1.copyWithin(0,3,4));//expected output:Array["d","b","c","d","e"]//copy to index1allelementsfromindex3to the end console.log(array1.copyWithin(1,3));//expected output:Array["d...
array.copyWidthin(target,start,end) //参数 描述 target 必需。复制到指定索引位置。 start 可选。元素复制的起始位置。 end 可选。停止复制的索引位置(默认为 array.length)。如果为负值,表示倒数。 //技术细节 JavaScript版本: ECMAScript 6 实例
Set([1, 3, 3]), map: new Map([[1, 2]]), regex: /foo/, deep: { array: ...