There are six functions, read each comment and write the return statements for each of them

Question

Hi everyone I am hoping I can get some help here and someone can explain this to me. I am in a coding class and I cannot figure this out for the life of me. This is the code I need to finish. I cannot seem to get this right. Can anyone help? I have tried to add the lines of code needed multiple different ways so I finally restarted everything and I am lost.

// Instructions
// - Given the following 6 empty functions, add the right return statement to each of 
them to complete the activity
// Please do not change any of the function names

//This is your starting array
const arr = [10, 10, 16, 12];

function returnFirst(arr) {
  // return the first item from the array
}

function returnLast(arr) {
  // return the last item of the array
}

function getArrayLength(arr) {
  // return the length of the array
}

function incrementByOne(arr) {
  // arr is an array of integers(numbers), Increment all items in the array by
  // return the array
}

function addItemToArray(arr, item) {
  // add the parameter item to the end of the array arr
  // return the array
}

function addItemToFront(arr, item) {
  // add the parameter item to the front of the array arr
  // return the array
  // hint: use the array method .unshift
}

//uncomment these lines to check results in browser console
// console.log("returnFirst result:" + returnFirst(arr))
// console.log("returnLast result:" + returnLast(arr))
// console.log("getArrayLength result:" + getArrayLength(arr))
// console.log("incrementByOne result:" + incrementByOne(arr))
// console.log("addItemToArray result:" + addItemToArray(arr, 10))
// console.log("addItemToFront result:" + addItemToFront(arr, 10))

//////////////////////////////////
//don't change this line
if (typeof module !== 'undefined') {
  module.exports = {
    returnFirst,
    returnLast,
    getArrayLength,
    incrementByOne,
    addItemToArray,
    addItemToFront,
  };
}

Answer 1

You don't say what language this is but I assume it's javascript. The question is asking you to find the syntax to read or manipulate the initial array and tag it onto the end of a return statement. So the first answer might be something like: return arr[0] which should show the first (zero indexed) item in the array. The whole function then looks like:

function returnFirst(arr) {
  // return the first item from the array
  return arr[0];
}