I'm really struggling to understand this one!

JavaScript
1
  1. I don’t understand why the .push() is applied to arr. 2. What is the purpose of adding the 2nd argument of the function to the 1st argument of a function.
  2. Then if we remove the first element of the array (doesn’t it only have one element (the item))?
  3. Isn’t an array generally represented with […, …]. At what point is the array (arr) declared?

I’m so hopeless lost with this question. Please help.

  **Your code so far**


function nextInLine(arr, item) {
// Only change code below this line

return item;
// 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));

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36

Challenge: Stand in Line

Link to the challenge:

3

I don’t see any of what you are asking in your code. Did you forget to paste it in?

The challenge introduces the concept of a queue. That’s how a queue works.

4

Hi bbsmooth, Thank you for prompt reply.

To answer your question. Basically, I wasn’t understanding it to the point of adding any code. Initially I tried adding.
testArr.push();
testArr.shift();
as testArr = [1,2, 3, 4, 5]; was the only array that I could see in the code.

I’m thinking now I need to look into queues, as I haven’t come across this before.

5

The array you will be manipulating is the arr parameter passed into the function. This is the queue. Perhaps they could have named that parameter a little better?

So you want to do the following to arr:

  • Add the number passed into the function as the second parameter (item) to the end of arr
  • Remove the first element from arr

And then the function should return the element that was removed.

6

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