I have copied the solution from this site itself but it's showing error like "TypeError: Cannot read properties of undefined (reading 'push')"

Tell us what’s happening:
Describe your issue in detail here.

  **Your code so far**

function nextInLine(arr, item) {
// Only change code below this line
//I'm trying to push an item to this array here but It show error  "TypeError: Cannot read properties of undefined (reading 'push')"
var removed = arr.shift();
return removed;
// Only change code above this line


// Setup
nextInLine([], 5);
nextInLine([], 1);
nextInLine([2], 1);
nextInLine([5,6,7,8,9], 1);
nextInLine(testArr, 10);
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/95.0.4638.54 Safari/537.36

Challenge: Stand in Line

Link to the challenge:

Hello there.

Do you have a question?

If so, please edit your post to include it in the Tell us what’s happening section.

Learning to describe problems is an important part of learning how to code.

Also, the more information you give us, the more likely we are to be able to help.

The three lines of code in the nextInLine function are correct. Your issue is that you added additional calls to nextInLine below the function. In general, you should only make changes exactly where instructed and not change anything else. Click the “Reset All Code” button to get a fresh start and only make changes in the nextInLine function.

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