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Challenge 87: Matrix Builder

curriculum/challenges/english/blocks/daily-coding-challenges-javascript/68ee9e3066cfd4eb2328e8a6.md

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--description--

Given two integers (a number of rows and a number of columns), return a matrix (an array of arrays) filled with zeros (0) of the given size.

For example, given 2 and 3, return:

json
[
  [0, 0, 0],
  [0, 0, 0]
]

--hints--

buildMatrix(2, 3) should return [[0, 0, 0], [0, 0, 0]].

js
assert.deepEqual(buildMatrix(2, 3), [[0, 0, 0], [0, 0, 0]]);

buildMatrix(3, 2) should return [[0, 0], [0, 0], [0, 0]].

js
assert.deepEqual(buildMatrix(3, 2), [[0, 0], [0, 0], [0, 0]]);

buildMatrix(4, 3) should return [[0, 0, 0], [0, 0, 0], [0, 0, 0], [0, 0, 0]].

js
assert.deepEqual(buildMatrix(4, 3), [[0, 0, 0], [0, 0, 0], [0, 0, 0], [0, 0, 0]]);

buildMatrix(9, 1) should return [[0], [0], [0], [0], [0], [0], [0], [0], [0]].

js
assert.deepEqual(buildMatrix(9, 1), [[0], [0], [0], [0], [0], [0], [0], [0], [0]]);

--seed--

--seed-contents--

js
function buildMatrix(rows, cols) {

  return rows;
}

--solutions--

js
function buildMatrix(rows, cols) {
  const matrix = [];
  for (let i = 0; i < rows; i++) {
    const row = new Array(cols).fill(0);
    matrix.push(row);
  }
  return matrix;
}