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callbacks.js
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104 lines (84 loc) · 2.13 KB
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const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum'];
//MAIN ARRAY CALLBACK
function arrayItems(arr, type){
switch (type){
case "first":
return arr[0];
break;
case "last":
return arr[arr.length - 1];
break;
case "length":
return arr.length;
break;
}
}
//MAIN ARITHMETIC FUNCTIONS
function doMath(x, y, operation){
switch (operation){
case "sum":
return x + y;
break;
case "multiply":
return x * y;
break;
}
}
//REDUNDANT
function checkFirst(arr){
return arr[0];
}
function arrayLength(arr){
return arr.length - 1;
}
//CHALLENGE
function firstItem(arr, cb) {
// firstItem passes the first item of the given array to the callback function.
return cb(arr, "first");
}
firstItem(items, arrayItems);
function getLength(arr, cb) {
// getLength passes the length of the array into the callback.
return cb(arr, "length");
}
getLength(items, arrayItems);
function last(arr, cb) {
// last passes the last item of the array into the callback.
return cb(arr, "last");
}
last(items, arrayItems);
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
return cb(x, y, "sum");
}
sumNums(3, 4, doMath);
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
return cb(x, y, "multiply")
}
multiplyNums(7, 10, doMath);
function itemInArray(item, arr){
if (arr.indexOf(item) == -1){
return false;
}
else{
return true;
}
}
//using === TEST pending
function itemInArrayTwo(item, arr){
return arr.indexOf(item) === -1;
}
function contains(item, list, cb) {
// contains checks if an item is present inside of the given array/list.
// Pass true to the callback if it is, otherwise pass false.
return cb(item, list, itemInArray);
}
contains("yo-yo", items, itemInArray);
contains("nope", items, itemInArray);
/* STRETCH PROBLEM */
function removeDuplicates(array, cb) {
// removeDuplicates removes all duplicate values from the given array.
// Pass the duplicate free array to the callback function.
// Do not mutate the original array.
}