1. Travis

next_in_line_example.js

// My Comments start with '//' so that you can paste this into 'chrome developer console' in your broswer to test it out

// '=>'' is the return values after running the commands;

// 1. set the array

var testArr = [1,2,3]

// 2. use the array function push(n) to add something to end of array.
// Note that it returns the size of the arrry (not the value)

testArr.push(4)

// => 4

// 3. Check the array that it does indeed have 4 items

testArr

// => [1, 2, 3, 4]

// 4. use pop(n) to remove items from back of array
// The '3' is how many things are left

testArr.pop(1)

// => 3

// 5. see, 3 things.

testArr

// => [1, 2, 3]

// 6. use unshift(N) to add things to the front of the Array
// Unshift returns size of array (4)

testArr.unshift('A')

// => 4

// 7. Now, Array has front thing but not back thing.
testArr

=> ['A', 1, 2, 3]


// 8. Your custom function will make use of these kinds of methods. For example - 

function nextInLine(array, item) {
  array.unshift
  return array[0]
  // This is an example not actual solution :-)
  // But let me know if you need help.
}