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callbacks.js
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88 lines (70 loc) · 2.04 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);
}
getLength(items, function(length){
console.log(length);
})
function last(arr, cb) {
// last passes the last item of the array into the callback.
return cb(arr.pop());
}
last(items, function(pop){
console.log(pop);
})
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
return cb(x,y);
}
const add = function(a, b){
console.log(a + b);
}
sumNums(2, 3, add);
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
return cb(x, y);
}
const multiply = function(x, y){
console.log(x * y);
}
multiplyNums(5, 5, multiply);
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 ispresent = 0;
for(let i = 0; i < list.length; i++) {
if(list[i] === item) {
ispresent++;
}
}
if(ispresent > 0) {
return cb(true);
} else {
return cb(false);
}
}
contains('Pencil', items, function(check){
console.log(check);
});
/* 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.
}