Find the middle index of the array using the length/2 and Math ceil() method and then use this middle index and Array splice() method to split the array into two in JavaScript.
var half_length = Math.ceil(arrayName.length / 2);
var leftSide = arrayName.slice(0,half_length);JavaScript split array into two
Simple example code.
list.splice(0, middleIndex)removes the first 3 elements starting from 0 indexes from an array and returns it.list.splice(-middleIndex)removes the last 3 elements from an array and returns it.
<!DOCTYPE html>
<html>
<body>
<script >
const arr = [1, 2, 3, 4, 5, 6];
const middleIndex = Math.ceil(arr.length / 2);
const f = arr.splice(0, middleIndex);
const s = arr.splice(-middleIndex);
console.log(f);
console.log(s);
console.log(arr);
</script>
</body>
</html>Output:
If you don’t want to change the original array, this can also be done by chaining Array.slice() method with Array.splice().
const list = [1, 2, 3, 4, 5, 6];
const middleIndex = Math.ceil(list.length / 2);
const f= list.slice().splice(0, middleIndex);
const s= list.slice().splice(-middleIndex);
console.log(f); // [1, 2, 3]
console.log(s); // [4, 5, 6]
console.log(list); // [1, 2, 3, 4, 5, 6];Do comment if you have any doubts or suggestions on this Js array topic,
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version