stand-in-line.md

You first need to insert the item to the end of the array arr using the method push() on the array arr. And then remove and return the first element of the array using shift() method on the array arr.

• push(): Add items to then end of an array. push() returns the new array length.
• shift(): Remove an item from the beginning of an array. shift() returns the removed item.
• pop(): Remove an item from the end of an array. pop() returns the removed item.
• unshift(): Add items to the beginning of an array. unshift() returns the new array length.

var myArray = [1,2,3,4,5];

myArray; //[1,2,3,4,5]

myArray.push(8); // 6 (new length)

myArray; //[1,2,3,4,5,8]

myArray.shift(); // 1 (removed item)

myArray; // [2,3,4,5,8]

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Hey. I am having a really hard time understanding this challenge. Could you help me?

push() can be applied to an array and requires an element to be inserted into the array.

arr.push(item);

Similarly shift() removes the first element of the array and returns it.

arr.shift(); // removes the first element and returns it.

So you can do

return arr.shift(); // removes the first element and returns it from the function

Okay...
So the code looks like this:

function nextInLine(arr, item) {
  
  arr.push(item);
  arr.shift();
  
  return item; 
}

What should I do next?
And could you also explain a little more what it means for the shift() method to return the element that it removes?

When you write
arr.shift();
that line of code will get replaced with the removed element.

arr = [5, 6, 7];

arr.shift(); this line will change to 5

so you can directly return arr.shift();

Okay... It's starting to make sense now.

I have changed the line that requires modification from 'return item;' to 'return arr.shift();', but it doesn't complete the challenge.
Is there something I am missing or getting wrong?

I think you are using shift() twice.

function nextInLine(arr, item) {

  arr.push(item);
   
  return arr.shift();  
}

My goodness! Yes I was using shift() twice.
It now works, and I completely understand what has happened (although it makes me feel kind of dumb that I didn't figure it out earlier :\ )
I am very grateful for your help.

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