Stand in Line

Summary

A queue is an abstract Data Structure where items are kept in order.
New items are added to the back of the queue, and old items are taken off.

Final Code

function nextInLine(arr, item) {
  // Only change code below this line
  arr.push(item);
  arr.push(item);
  return arr.shift();
  // Only change code above this line
  

}

// 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));