let arrayCopy = [...nestedArray]; // Make some changes arrayCopy[0] = '👻'; // change shallow element arrayCopy[1][0] = '💩'; // change nested element console.log(arrayCopy); // [ '👻', [ '💩' ], 3 ] // ❌ Nested array got affected console.log(nestedArray); /...
constkitchenSink={set:newSet([1,3,3]),map:newMap([[1,2]]),regex:/foo/,deep:{array:[newFile(someBlobData,'file.txt')]},error:newError('Hello!')}constveryProblematicCopy=JSON.parse(JSON.stringify(kitchenSink)) 我们会得到: {"set":{},"map":{},"regex":{},"deep":{"array":[{...
使用展开运算符(Spread Operator):constoriginalArray=[1,2,{a:3}];constshallowCopyArray=[...ori...
deep: { array: [ new File(someBlobData, 'file.txt') ] }, error: new Error('Hello!') } const veryProblematicCopy =JSON.parse(JSON.stringify(kitchenSink)) 我们会得到这样的结果: { "set": {}, "map": {}, "regex": {}, "deep": { "array": [ {} ] }, "error": {}, } 是...
They are deep copy and shallow copy.Firstly, let’s discuss shallow copy. A shallow copy of an object has properties that point to the same reference as the source object’s properties.Here, the source object is the object from which the copy is made. Since the object and its shallow ...
var src, copyIsArray, copy, name, options, clone, target = arguments[0] || {}, i = 1, length = arguments.length, deep = false; // Handle a deep copy situation if ( typeof target === "boolean" ) { deep = target; // skip the boolean and the target ...
const obj = { name : 'ABC', age : 18, habbit : ['baseball', 'football', ['genshin', 'princess']], family : { son : 'sp', father:'fa' } } const newObj = {} function deepCopy(obj, newObj){ for(k in obj){ if(obj[k] instanceof Array){ const arr = [] deepCopy(ob...
function deepCopy(obj) { if (typeof obj !== 'object' || obj === null) { return obj; } let copy; if (Array.isArray(obj)) { copy = []; for (let i = 0; i < obj.length; i++) { copy[i] = deepCopy(obj[i]); } } else { copy = {}; for (let key in obj) { ...
function deepCopy(obj) { if(typeof obj !== 'object' || obj === null) { return obj; } if(obj instanceof Date) { return new Date(obj.getTime()); } if(obj instanceof Array) { return obj.reduce((arr, item, i) => { arr[i] = deepCopy(item); return arr; }, []); } ...
如果你需要一个嵌套的数组的拷贝,那需要你去深度拷贝这个数组。深拷贝,选择JSON方法或者Lodsh库吧const numbers = [1, [2], [3, [4]], 5];// Using JavaScriptJSON.parse(JSON.stringify(numbers));// Using Lodash_.cloneDeep(objects);数组是引用类型为了搞清楚为什么有两种类型的拷贝,我们...