How does below this code give answer 012 ?

Question

var x=['a','b','c'];
var arr=";
For(var y in x){
arr+=y;
}
alert(arr);

Answer 1

The output you are getting is due to using for-in loop improperly.

The for-in provides the index to each element in the array so you have to use x[y] to get the actual element.

By the way, you can use for-of loop to iterate over arrays.

https://code.sololearn.com/WDLlUq63kB8u/#js