Returns an array with arrays of the given size.

chunk_array.js

/**
 * Returns an array with arrays of the given size.
 *
 * @param myArray {Array} Array to split
 * @param chunkSize {Integer} Size of every group
 *
 * https://binbytes.com/blog/split-an-array-into-chunks-of-a-given-size-in-javascript
 */
function chunkArray(myArray, chunk_size) {
    let results = [];
    
    while (myArray.length) {
        results.push(myArray.splice(0, chunk_size))
    }

    return results;
}

// Usage

// Split in group of 3 items
var result = chunkArray([1,2,3,4,5,6,7,8], 3)

// Outputs : [ [1,2,3] , [4,5,6] ,[7,8] ]
console.log(result)