Cloning an array in JavaScript implementation code _javascript tips

08 A company JS interview question, the position is JavaScript engineer (go to Google)

The interviewer asked me how to clone an array, when I thought of the next JS object without the Clone method, Java object has.

So how do we get a new array?

I replied: Use a loop to push the source array elements into the new array in turn. This is the easiest way, but it's obviously not the answer the interviewer wants.

Finally told me: the use of array slice method. Examples are as follows:

Copy Code code as follows:

var ary = [1,2,3];//source array
var ary2 = ary.slice (0);//Clone a new array
Console.log (Ary2);

/* Change Ary2, does not affect the ARY, the description is indeed two arrays rather than references
* If it is two references, change any of them to the same array operation
*/
Ary2[0] = 10;
Console.log (Ary2);
Console.log (ary);