Question

How to split an array into array of arrays with TypeScript

Answer 1

// two-dimensional array = nested array = array of arrays
 
function createArrayOfArrays(arr: number[], size: number): number[][] {
    const arrayofArrays: number[][] = [];
 
    for (let i: number = 0; i < arr.length; i += size) {
        arrayofArrays.push(arr.slice(i, i + size));
    }
 
    return arrayofArrays;
}
 
const originalArray: number[] = [1, 2, 3, 4, 5, 6, 7];
const chunkSize: number = 3;
const arrayofArrays: number[][] = createArrayOfArrays(originalArray, chunkSize);
 
console.log(arrayofArrays);           // [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7 ] ]
console.log(arrayofArrays[0]);        // [ 1, 2, 3 ]
console.log(arrayofArrays[1]);        // [ 4, 5, 6 ]
console.log(arrayofArrays[0][1]);     // 2
console.log(arrayofArrays[1][2]);     // 6
 
 
 
/*
run:
 
[[1, 2, 3], [4, 5, 6], [7]] 
[1, 2, 3] 
[4, 5, 6] 
2 
6 
 
*/

 

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