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callbacks.js
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74 lines (57 loc) · 1.86 KB
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// Create a callback function and invoke the function to test your work. You have been provided an example of a problem and a solution to see how this works with our items array. Study both the problem and the solution to figure out the rest of the problems.
const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum'];
/*
//Given this problem:
function firstItem(arr, cb) {
// firstItem passes the first item of the given array to the callback function.
}
// Potential Solution:
function firstItem(arr, cb) {
return cb(arr[0]);
}
firstItem(items, function(first) {
console.log(first)
});
*/
function getLength(arr, cb) {
// getLength passes the length of the array into the callback.
return cb(arr.length);
}
function last(arr, cb) {
// last passes the last item of the array into the callback.
return cb(arr[arr.length-1]);
}
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
return cb(x + y);
}
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
return cb(x * y);
}
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.
let placeHolder = [];
for (let i=0; i<list.length; i++){
if (item === list[i]){
placeHolder.push(list[i]);
}
}
if (!placeHolder[0]){
return cb(false);
} else {
return cb(true);
}
}
// --ES6--
// function contains(item, list, cb) {
// cb(list.includes(item));
// }
contains('Pencil', items, (cb) => (console.log(cb)));
/* 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.
}