Basic JavaScript - Stand in Line

Tell us what’s happening:
Describe your issue in detail here.
I can’t understand the elements of the arr.item function and their logic or usefulness.
Thank you

Your code so far

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



// Setup
let 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/118.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Stand in Line

Link to the challenge:

Do you mean these two parameters? They’re function arguments, their usefulness is that values are passed to them.

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