I didnt understand the logic in this challange

Tell us what’s happening:

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/85.0.4183.102 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.

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

i have passed test by example but did’nt understood logic can you explain each line code briefly.

can you explain first what you understand?

my questions are where arr is defined and how is 6 defined as item and what is testArr and how it is used in above function

arr and item are defined as function parameters

they get a value when the function is called:

testArr is defined in the editor:

oh! thanks a lot dont know why was i unable to understand at first