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---
id: 56533eb9ac21ba0edf2244c6
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title: Stand in Line
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challengeType: 1
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videoUrl: 'https://scrimba.com/c/ca8Q8tP'
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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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
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
assert(nextInLine([5, 6, 7, 8, 9], 1) === 5);
```
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After `nextInLine(testArr, 10)` , `testArr[4]` should be `10`
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```js
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nextInLine(testArr, 10);
assert(testArr[4] === 10);
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```
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# --seed--
## --before-user-code--
```js
var logOutput = [];
var originalConsole = console
function capture() {
var nativeLog = console.log;
console.log = function (message) {
logOutput.push(message);
if(nativeLog.apply) {
nativeLog.apply(originalConsole, arguments);
} else {
var nativeMsg = Array.prototype.slice.apply(arguments).join(' ');
nativeLog(nativeMsg);
}
};
}
function uncapture() {
console.log = originalConsole.log;
}
capture();
```
## --after-user-code--
```js
uncapture();
testArr = [1,2,3,4,5];
(function() { return logOutput.join("\n");})();
```
## --seed-contents--
```js
function nextInLine(arr, item) {
// Only change code below this line
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return item;
// Only change code above this line
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}
// Setup
var testArr = [1,2,3,4,5];
// Display code
console.log("Before: " + JSON.stringify(testArr));
console.log(nextInLine(testArr, 6));
console.log("After: " + JSON.stringify(testArr));
```
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# --solutions--
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```js
var testArr = [ 1,2,3,4,5];
function nextInLine(arr, item) {
arr.push(item);
return arr.shift();
}
```