140 lines
2.4 KiB
Markdown
140 lines
2.4 KiB
Markdown
---
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id: 5e6dd15004c88cf00d2a78b3
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title: Loop over multiple arrays simultaneously
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challengeType: 5
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forumTopicId: 385279
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dashedName: loop-over-multiple-arrays-simultaneously
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---
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# --description--
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Loop over multiple arrays and create a new array whose $i^{th}$ element is the concatenation of $i^{th}$ element of each of the given.
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For this example, if you are given this array of arrays:
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```js
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[ ["a", "b", "c"], ["A", "B", "C"], [1, 2, 3] ]
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```
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the output should be:
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```js
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["aA1","bB2","cC3"]
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```
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# --instructions--
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Write a function that takes an array of arrays as a parameter and returns an array of strings satisfying the given description.
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# --hints--
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`loopSimult` should be a function.
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```js
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assert(typeof loopSimult == 'function');
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```
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`loopSimult([["a", "b", "c"], ["A", "B", "C"], [1, 2, 3]])` should return a array.
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```js
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assert(
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Array.isArray(
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loopSimult([
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['a', 'b', 'c'],
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['A', 'B', 'C'],
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[1, 2, 3]
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])
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)
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);
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```
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`loopSimult([["a", "b", "c"], ["A", "B", "C"], [1, 2, 3]])` should return `["aA1", "bB2", "cC3"]`.
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```js
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assert.deepEqual(
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loopSimult([
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['a', 'b', 'c'],
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['A', 'B', 'C'],
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[1, 2, 3]
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]),
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['aA1', 'bB2', 'cC3']
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);
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```
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`loopSimult([["c", "b", "c"], ["4", "5", "C"], [7, 7, 3]])` should return `["c47", "b57", "cC3"]`.
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```js
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assert.deepEqual(
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loopSimult([
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['c', 'b', 'c'],
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['4', '5', 'C'],
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[7, 7, 3]
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]),
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['c47', 'b57', 'cC3']
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);
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```
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`loopSimult([["a", "b", "c", "d"], ["A", "B", "C", "d"], [1, 2, 3, 4]])` should return `["aA1", "bB2", "cC3", "dd4"]`.
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```js
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assert.deepEqual(
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loopSimult([
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['a', 'b', 'c', 'd'],
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['A', 'B', 'C', 'd'],
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[1, 2, 3, 4]
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]),
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['aA1', 'bB2', 'cC3', 'dd4']
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);
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```
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`loopSimult([["a", "b"], ["A", "B"], [1, 2]])` should return `["aA1", "bB2"]`.
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```js
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assert.deepEqual(
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loopSimult([
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['a', 'b'],
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['A', 'B'],
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[1, 2]
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]),
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['aA1', 'bB2']
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);
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```
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`loopSimult([["b", "c"], ["B", "C"], [2, 3]])` should return `["bB2", "cC3"]`.
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```js
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assert.deepEqual(
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loopSimult([
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['b', 'c'],
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['B', 'C'],
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[2, 3]
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]),
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['bB2', 'cC3']
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);
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```
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# --seed--
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## --seed-contents--
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```js
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function loopSimult(A) {
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}
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```
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# --solutions--
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```js
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function loopSimult(A) {
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var res = [], output;
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for (var i = 0; i < A[0].length; i += 1) {
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output = "";
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for (var j = 0; j < A.length; j++)
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output += A[j][i];
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res.push(output);
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}
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return res;
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}
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```
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