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78 lines
1.5 KiB
Markdown
78 lines
1.5 KiB
Markdown
---
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id: 56533eb9ac21ba0edf2244c6
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title: Stand in Line
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challengeType: 1
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forumTopicId: 18307
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dashedName: stand-in-line
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---
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# --description--
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In Computer Science a <dfn>queue</dfn> is an abstract <dfn>Data Structure</dfn> where items are kept in order. New items can be added at the back of the queue and old items are taken off from the front of the queue.
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# --instructions--
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Write a function `nextInLine` which takes an array (`arr`) and a number (`item`) as arguments.
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Add the number to the end of the array, then remove the first element of the array.
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The `nextInLine` function should then return the element that was removed.
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# --hints--
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`nextInLine([], 5)` should return a number.
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```js
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assert.isNumber(nextInLine([], 5));
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```
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`nextInLine([], 1)` should return `1`
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```js
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assert(nextInLine([], 1) === 1);
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```
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`nextInLine([2], 1)` should return `2`
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```js
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assert(nextInLine([2], 1) === 2);
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```
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`nextInLine([5,6,7,8,9], 1)` should return `5`
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```js
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assert(nextInLine([5, 6, 7, 8, 9], 1) === 5);
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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 nextInLine(arr, item) {
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// Only change code below this line
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return item;
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// Only change code above this line
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}
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// Setup
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let testArr = [1, 2, 3, 4, 5];
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// Display code
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console.log("Before: " + JSON.stringify(testArr));
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console.log(nextInLine(testArr, 6));
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console.log("After: " + JSON.stringify(testArr));
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```
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# --solutions--
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```js
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let testArr = [1, 2, 3, 4, 5];
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function nextInLine(arr, item) {
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arr.push(item);
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return arr.shift();
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}
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```
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