3.9 KiB
3.9 KiB
title | id | challengeType |
---|---|---|
Element-wise operations | 599c333915e0ea32d04d4bec | 5 |
Description
- addition
- subtraction
- multiplication
- division
- exponentiation
Instructions
Tests
tests:
- text: <code>operation</code> is a function.
testString: assert(typeof operation === 'function', '<code>operation</code> is a function.');
- text: <code>operation("m_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[2,4],[6,8]]</code>.
testString: assert.deepEqual(operation('m_add', [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[2, 4], [6, 8]], '<code>operation("m_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[2,4],[6,8]]</code>.');
- text: <code>operation("s_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[3,4],[5,6]]</code>.
testString: assert.deepEqual(operation('s_add', [[1, 2], [3, 4]], 2), [[3, 4], [5, 6]], '<code>operation("s_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[3,4],[5,6]]</code>.');
- text: <code>operation("m_sub",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[0,0],[0,0]]</code>.
testString: assert.deepEqual(operation('m_sub', [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[0, 0], [0, 0]], '<code>operation("m_sub",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[0,0],[0,0]]</code>.');
- text: <code>operation("m_mult",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[9,16]]</code>.
testString: assert.deepEqual(operation('m_mult', [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[1, 4], [9, 16]], '<code>operation("m_mult",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[9,16]]</code>.');
- text: <code>operation("m_div",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,1],[1,1]]</code>.
testString: assert.deepEqual(operation('m_div', [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[1, 1], [1, 1]], '<code>operation("m_div",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,1],[1,1]]</code>.');
- text: <code>operation("m_exp",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[27,256]]</code>.
testString: assert.deepEqual(operation('m_exp', [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[1, 4], [27, 256]], '<code>operation("m_exp",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[27,256]]</code>.');
- text: <code>operation("m_add",[[1,2,3,4],[5,6,7,8]],[[9,10,11,12],[13,14,15,16]])</code> should return <code>[[10,12,14,16],[18,20,22,24]]</code>.
testString: assert.deepEqual(operation('m_add', [[1, 2, 3, 4], [5, 6, 7, 8]], [[9, 10, 11, 12], [13, 14, 15, 16]]), [[10, 12, 14, 16], [18, 20, 22, 24]], '<code>operation("m_add",[[1,2,3,4],[5,6,7,8]],[[9,10,11,12],[13,14,15,16]])</code> should return <code>[[10,12,14,16],[18,20,22,24]]</code>.');
Challenge Seed
function operation(op, arr1, arr2) {
// Good luck!
}
Solution
function operation(op, arr1, arr2) {
const ops = {
add: ((a, b) => a + b),
sub: ((a, b) => a - b),
mult: ((a, b) => a * b),
div: ((a, b) => a / b),
exp: ((a, b) => Math.pow(a, b))
};
const ifm = op.startsWith('m');
const doOp = ops[op.substring(2)];
for (let i = 0; i < arr1.length; i++) {
for (let j = 0; j < arr1[0].length; j++) {
arr1[i][j] = doOp(arr1[i][j], (ifm) ? (arr2[i][j]) : (arr2));
}
}
return arr1;
}