Chunk Array in JavaScript
Given an array arr
and a chunk size size
, return a chunked array. A chunked array contains the original elements in arr
, but consists of subarrays each of length size
. The length of the last subarray may be less than size
if arr.length
is not evenly divisible by size
.
You may assume the array is the output of JSON.parse
. In other words, it is valid JSON.
Please solve it without using lodash’s _.chunk
function.
Example 1:
Input: arr = [1,2,3,4,5], size = 1 Output: [[1],[2],[3],[4],[5]] Explanation: The arr has been split into subarrays each with 1 element.
Example 2:
Input: arr = [1,9,6,3,2], size = 3 Output: [[1,9,6],[3,2]] Explanation: The arr has been split into subarrays with 3 elements. However, only two elements are left for the 2nd subarray.
Example 3:
Input: arr = [8,5,3,2,6], size = 6 Output: [[8,5,3,2,6]] Explanation: Size is greater than arr.length thus all elements are in the first subarray.
Example 4:
Input: arr = [], size = 1 Output: [] Explanation: There are no elements to be chunked so an empty array is returned.
/**
* @param {Array} arr
* @param {number} size
* @return {Array[]}
*/
var chunk = function(arr, size) {
var chunks = [];
for (var i = 0; i < arr.length; i += size) {
chunks.push(arr.slice(i, i + size));
}
return chunks;
};
var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var chunks = chunk(arr, 3);
console.log(chunks);