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callbacks.js
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54 lines (48 loc) · 1.55 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.
let sum = x + y;
return cb(sum);
}
// sumNums(9, 8, console.log);
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
let multiply = x*y;
return cb(multiply);
}
// multiplyNums(4, 5, 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.
// if (item in list)
for (let i=0; i<list.length; i++) {
if (list[i] === item) {
return cb(true);
}
}; return cb(false);
}
// contains('Gum', items, console.log);
// if (list[i] === item) {
// return cb(true);
// } else return cb(false);
/* 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.
}