It appears my code delivers what the lesson requires, yet it indicates an error.

Challenge Stand in Line has an issue. User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36. Please describe how to reproduce this issue, and include links to screenshots if possible.

My code:

function nextInLine(arr, item) {
  arr.push(item);
  return arr.splice(0, 1);
}

// Test Setup
var testArr = [];

// Display Code
console.log("Before: " + JSON.stringify(testArr));
console.log(nextInLine(testArr, 1));
console.log("After: " + JSON.stringify(testArr));

It appears my code delivers what the lesson requires, yet it indicates an error.

[raisedadead]

.splice will return an array, while the tests are looking for a number. Hence with although your code prints the correct output it fails the test.

I feel we should add a testcase stating:

nextInLine should return a number.

[ja5087]

@knappsacks You’ve set arr to arr.push(item), which returns an integer representing the new length of the array. arr now has the value of 6, and therefore arr.shift is not a function. The key idea is that arr.push(item) modifies the array itself, and doesn’t need the assignment.