A better way to splice an array into an array in javascript

Question

Is there a better way than this to splice an array into another array in javascript

var string = \'theArray.splice(\'+start+\', \'+number+\',\"\'+newItemsArr         


        

Answer 1

UPDATE: ES6 version

If your coding in ES6 you can use the "spread operator" (...)

array.splice(index, 0, ...arrayToInsert);

To learn more about the spread operator see mozilla documentation.

The 'old' ES5 way

If you wrap the top answer into a function you get this:

function insertArrayAt(array, index, arrayToInsert) {
    Array.prototype.splice.apply(array, [index, 0].concat(arrayToInsert));
}

You would use it like this:

var arr = ["A", "B", "C"];
insertArrayAt(arr, 1, ["x", "y", "z"]);
alert(JSON.stringify(arr)); // output: A, x, y, z, B, C

You can check it out in this jsFiddle: http://jsfiddle.net/luisperezphd/Wc8aS/