Detailed explanation of JavaScript array copy

Previous words

Object copy was introduced in the previous blog post. This article will introduce array copy in detail

push

function copyArray(arr){
  var result = [];
  for(var i = 0; i < arr.length; i++){
    result.push(arr[i]);
  }
  return result;
}
 
var obj1=[1,2,3];
var obj2=copyArray(obj1);
console.log(obj1); //[1,2,3]
console.log(obj2); //[1,2,3]
obj2.push(4);
console.log(obj1); //[1,2,3]
console.log(obj2); //[1,2,3,4]

join
The disadvantage of using this method is that all the items in the array become strings

function copyArray(arr){
  var result = [];
  result = arr.join().split(',');
  return result;
}
 
var obj1=[1,2,3];
var obj2=copyArray(obj1);
console.log(obj1); //[1,2,3]
console.log(obj2); //['1','2','3']
obj2.push(4);
console.log(obj1); //[1,2,3]
console.log(obj2); //['1','2','3',4]

concat

function copyArray(arr){
  var result = [];
  result = arr.concat();
  return result;
}
 
var obj1=[1,2,3];
var obj2=copyArray(obj1);
console.log(obj1); //[1,2,3]
console.log(obj2); //[1,2,3]
obj2.push(4);
console.log(obj1); //[1,2,3]
console.log(obj2); //[1,2,3,4]

slice

function copyArray(arr){
  var result = [];
  result = arr.slice();
  return result;
}
 
var obj1=[1,2,3];
var obj2=copyArray(obj1);
console.log(obj1); //[1,2,3]
console.log(obj2); //[1,2,3]
obj2.push(4);
console.log(obj1); //[1,2,3]
console.log(obj2); //[1,2,3,4]

deep copy

The above method only implements a shallow copy of the array , if you want to implement deep copy of the array, you need to use the recursive method

function copyArray(arr,result){
  var result = result || [];
  for(var i = 0; i < arr.length; i++){
    if(arr[i] instanceof Array){
      result[i] = [];
      copyArray(arr[i],result[i]);
    }else{
      result[i] = arr[i];
    }     
  }
  return result;
}
 
var obj1=[1,2,[3,4]];
var obj2=copyArray(obj1);
console.log(obj1[2]); //[3,4]
console.log(obj2[2]); //[3,4]
obj2[2].push(5);
console.log(obj1[2]); //[3,4]
console.log(obj2[2]); //[3,4,5]

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