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callbacks.js
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53 lines (46 loc) · 1.48 KB
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const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum',];
function firstItem(arr, cb) {
// firstItem passes the first item of the given array to the callback function.
return cb(arr[0]);
}
firstItem(items, console.log);
function getLength(arr, cb) {
// getLength passes the length of the array into the callback.
return cb(arr.length);
}
getLength(items, console.log)
function last(arr, cb) {
// last passes the last item of the array into the callback.
return cb(arr[arr.length - 1]);
}
last(items, console.log)
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
return cb(x + y);
}
sumNums(5,6, console.log)
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
return cb(x * y);
}
multiplyNums(2,3, console.log)
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(list.includes(item));
}
contains('Pencil', items, console.log)
/* STRETCH PROBLEM */
let dupArr = [];
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.
array.forEach(element => {
if (!dupArr.includes(element)) {
dupArr.push(element);
}
});
return cb(dupArr);
}
removeDuplicates(items, console.log)