Problem : Chunk Array | #2677 | LeetCode
Given an array arr and a chunk `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.
Solution:
/**
* @param {Array} arr
* @param {number} size
* @return {Array}
*/
var chunk = function(arr, size) {
const chunkarr = []
for(let i = 0; i<arr.length; i+=size){
var subarr = arr.slice(i, i+size);
chunkarr.push(subarr);
}
return chunkarr;
};
Explanation:
Let's break down the code step by step:
1. Initialize an empty array `chunkedArray` to store the chunked subarrays.
2. Use a `for` loop to iterate through the input array `arr`. The loop variable `i` represents the starting index of each chunk.
3. Inside the loop, use the `slice` method to extract a chunk of `size` elements from the original array. `arr.slice(i, i + size)` extracts a subarray starting from index `i` (inclusive) and ending at index `i + size` (exclusive).
4. Add the chunked subarray to the `chunkedArray` using the `push` method.
5. Repeat steps 3 and 4 until the entire input array has been processed.
6. Finally, return the `chunkedArray` containing the subarrays of the specified size.
The code creates subarrays of the desired size from the input array `arr` and returns a new array containing these subarrays.
