js array push array to index code example
Example 1: javascript insert item into array
var colors=["red","blue"];
var index=1;
//insert "white" at index 1
colors.splice(index, 0, "white"); //colors = ["red", "white", "blue"]
Example 2: javascript push in specific index
arr.splice(index, 0, item);
//explanation:
inserts "item" at the specified "index",
deleting 0 other items before it