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ES6 uses recursion to implement deep copy

2022-04-23 07:48:00 【Brother Bing】

//  Use recursion to implement deep copy 
let deepCopy = function(obj){
    
	//  Judge whether the deep copy is an array or an object , If it is an array, copy the array , Object, copy the object 
	let newObj = obj instanceof Array ? []: {
    };
	if (obj && typeof obj === 'object'){
    
		for (let key in obj){
    
			if (obj.hasOwnProperty(key)){
    
				newObj[key] = (obj[key] && typeof obj[key] === 'object') ? deepCopy(obj[key]) : obj[key];
			}
		 }
	}
	return newObj;
}
//  quote 
let arr = [...]
let newArr = deepCopy(arr);