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								---
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								id: 56533eb9ac21ba0edf2244c6
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								title: Stand in Line
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								challengeType: 1
							 
						 
					
						
							
								
									
										
										
										
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								videoUrl: ''
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								localeTitle: Hacer cola
							 
						 
					
						
							
								
									
										
										
										
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								---
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								## Description
  
						 
					
						
							
								
									
										
										
										
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								< section  id = "description" >  En Ciencias de la Computación una < dfn > cola< / dfn >  es una < dfn > estructura de datos< / dfn >  abstracta donde los elementos se mantienen en orden. Los nuevos elementos se pueden agregar al final de la < code > queue< / code >  y los elementos antiguos se quitan de la parte delantera de la < code > queue< / code >  . Escriba una función < code > nextInLine< / code >  que tome una matriz ( < code > arr< / code >  ) y un número ( < code > item< / code >  ) como argumentos. Agregue el número al final de la matriz, luego elimine el primer elemento de la matriz. La función < code > nextInLine< / code >  debería devolver el elemento que se eliminó. < / section >  
						 
					
						
							
								
									
										
										
										
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								## Instructions
  
						 
					
						
							
								
									
										
										
										
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								< section  id = "instructions" >  
						 
					
						
							
								
									
										
										
										
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								< / section >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								## Tests
  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< section  id = 'tests' >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								```yml
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								tests:
							 
						 
					
						
							
								
									
										
										
										
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								  -  text: '< code > nextInLine([], 5)</ code >  debe devolver un número.'
							 
						 
					
						
							
								
									
										
										
										
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								    testString: 'assert.isNumber(nextInLine([],5), "< code > nextInLine([], 5)< / code >  should return a number.");'
							 
						 
					
						
							
								
									
										
										
										
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								  -  text: '< code > nextInLine([], 1)</ code >  debe devolver < code > 1</ code > '
							 
						 
					
						
							
								
									
										
										
										
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								    testString: 'assert(nextInLine([],1) === 1, "< code > nextInLine([], 1)< / code >  should return < code > 1< / code > ");'
							 
						 
					
						
							
								
									
										
										
										
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								  -  text: '< code > nextInLine([2], 1)</ code >  debe devolver < code > 2</ code > '
							 
						 
					
						
							
								
									
										
										
										
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								    testString: 'assert(nextInLine([2],1) === 2, "< code > nextInLine([2], 1)< / code >  should return < code > 2< / code > ");'
							 
						 
					
						
							
								
									
										
										
										
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								  -  text: '< code > nextInLine([5,6,7,8,9], 1)</ code >  debe devolver < code > 5</ code > '
							 
						 
					
						
							
								
									
										
										
										
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								    testString: 'assert(nextInLine([5,6,7,8,9],1) === 5, "< code > nextInLine([5,6,7,8,9], 1)< / code >  should return < code > 5< / code > ");'
							 
						 
					
						
							
								
									
										
										
										
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								  -  text: 'Después de < code > nextInLine(testArr, 10)</ code >  , < code > testArr[4]</ code >  debe ser < code > 10</ code > '
							 
						 
					
						
							
								
									
										
										
										
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								    testString: 'nextInLine(testArr, 10); assert(testArr[4] === 10, "After < code > nextInLine(testArr, 10)< / code > , < code > testArr[4]< / code >  should be < code > 10< / code > ");'
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								```
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< / section >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								## Challenge Seed
  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< section  id = 'challengeSeed' >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< div  id = 'js-seed' >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								```js
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								function nextInLine(arr, item) {
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								  // Your code here
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								  return item;  // Change this line
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								}
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								// Test Setup
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								var testArr = [1,2,3,4,5];
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								// Display Code
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								console.log("Before: " + JSON.stringify(testArr));
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								console.log(nextInLine(testArr, 6)); // Modify this line to test
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								console.log("After: " + JSON.stringify(testArr));
							 
						 
					
						
							
								
									
										
										
										
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								```
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< / div >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								### Before Test
  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< div  id = 'js-setup' >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								```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();
							 
						 
					
						
							
								
									
										
										
										
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								```
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< / div >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								### After Test
  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< div  id = 'js-teardown' >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								```js
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								console.info('after the test');
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								```
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< / div >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< / section >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								## Solution
  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< section  id = 'solution' >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								```js
							 
						 
					
						
							
								
									
										
										
										
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								// solution required
							 
						 
					
						
							
								
									
										
										
										
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								```
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< / section >