Stand in Line - questions! RESOLVE! THANKS!

JavaScript
1

Tell us what’s happening:

Hi, I have a question, I wanna know why is not the same write this:

function nextInLine(arr, item) {
var queue = arr.push(item)
var rItem = arr.shift()
return rItem;
}

and write this:

function nextInLine(arr, item) {
var aux = item
item = arr[0]
arr[0] = item
return item;
}

this is my first time trying to code, please help me! ^^

Your code so far

function nextInLine(arr, item) {
  // Your code here
  var queue = arr.push(item)
  var rItem = arr.shift()
  return rItem;  // 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));

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0.

Link to the challenge:
https://www.freecodecamp.org/challenges/stand-in-line