Thinkful_JS_Array_Drills.js

//Make List
function makeList(item1, item2, item3) {
  return list = [item1, item2, item3];
}

//Add to array
function addToList(list, item) {
  var list = list;
  list.push(item);
  return list;
}

//Access array
function accessFirstItem(array) {
  return array[0];
}

function accessThirdItem(array) {
  return array[2];
}

//Length
function findLength(array) {
  return array.length;
}

function accessLastItem(array) {
  return array[array.length - 1];
}

//Slicing
function firstFourItems(array) {
  var new_array = array.slice(0, 4);
  return new_array;
}


function lastThreeItems(array) {
  var new_array = array.slice(-3);
  return new_array;
}

//Array copying
function minusLastItem(array) {
  array.pop();
  return array; 
}


function copyFirstHalf(array) {
  var new_array = [];
  var length = Math.floor(array.length/2);
  console.log(length);
  if (array.length % 2 != 0) {
    new_array = array.slice(0, length);}
  else {
    new_array = array.slice(0, array.length/2)}
  return new_array;
}

//Squares
function squared(num){
  return num * num;}
  
function squares(array) {
  return array.map(squared);
}

//Reverse sort
function reverse(a, b){
  return b-a;
}
function greatestToLeast(array) {
  return array.sort(reverse);
}

//String length
function length(string){
  return string.length < 5;
  }
function shortWords(array) {
  return array.filter(length);
}

//Find
function divisor(num){
  return num % 5 === 0;
}

function divisibleBy5(array) {
  return array.find(divisor);
}