# Constructing 2-D array based on some constraints in JavaScript

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

We are required to write a JavaScript function that creates a multi-dimensional array based on some inputs.

It should take in three elements, namely −

• row - the number of subarrays to be present in the array,

• col - the number of elements in each subarray,

• val - the val of each element in the subarrays,

For example, if the three inputs are 2, 3, 10

Then the output should be −

const output = [[10, 10, 10], [10, 10, 10]];

Therefore, let’s write the code for this function −

## Example

The code for this will be −

const row = 2;
const col = 3;
const val = 10;
const constructArray = (row, col, val) => {
const res = [];
for(let i = 0; i < row; i++){
for(let j = 0; j < col; j++){
if(!res[i]){
res[i] = [];
};
res[i][j] = val;
};
};
return res;
};
console.log(constructArray(row, col, val));

## Output

The output in the console will be −

[ [ 10, 10, 10 ], [ 10, 10, 10 ] ]