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74 lines (57 loc) · 1.71 KB
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const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum', "yo-yo"];
//displays callback
const displayCallback = (arr) => {
console.log(arr);
}
function firstItem(arr, cb) {
// firstItem passes the first item of the given array to the callback function.
cb(arr[0]);
}
firstItem(items, displayCallback);
function getLength(arr, cb) {
// getLength passes the length of the array into the callback.
cb(arr.length);
}
getLength(items, displayCallback);
function last(arr, cb) {
// last passes the last item of the array into the callback.
cb(arr[arr.length - 1]);
}
last(items, displayCallback);
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
cb(x + y);
}
sumNums(3, 4, displayCallback);
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
cb(x * y);
}
multiplyNums(3, 4, displayCallback);
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.
if(list.includes(item)){
cb(true);
}else{
cb(false);
}
}
contains("Gum", items, displayCallback);
contains("stick", items, displayCallback);
/* STRETCH PROBLEM */
function removeDuplicates(array, cb) {
let newArr = [];
array.forEach((element) => {
if (!newArr.includes(element)){
newArr.push(element);
} else {
console.log(`Duplicate element: ${element} skipped`);
}
});
// removeDuplicates removes all duplicate values from the given array.
// Pass the duplicate free array to the callback function.
// Do not mutate the original array.
cb(newArr);
}
removeDuplicates(items, displayCallback);