Stand in Line. Why arr is an array? where arr has ever been declared as an array?

Tell us what’s happening:
Describe your issue in detail here.
I just can’t see how arr from function nextInLine (arr, item) is an array here? is that making item an array too? I understant testArr is an array and methods can be applied to it but since when arr become an array? Thank you

  **Your code so far**

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

// Setup
const 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/101.0.4951.67 Safari/537.36

Challenge: Stand in Line

Link to the challenge:

arr is an array, passed down as a a parameter in the nextInLine function.

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