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callbacks.js
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83 lines (59 loc) · 2.1 KB
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// Create a higher order function and invoke the callback 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:
// Higher order function using "cb" as the call back
function firstItem(arr, cb) {
return cb(arr[0]);
}
// Function invocation
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[arr.length-1]);//gets the item at the last index
}
last(items, function(last){
console.log(last);
})
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
return cb(x + y);
}
sumNums(3, 5, function(sum){
console.log(sum);
});
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
return cb(x * y);
}
multiplyNums(4, 12, function(product){
console.log(product);
});
//const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum'];//items array for reference
// function contains(item, list, callback){
function contains(item, list, cb){
return cb(list.includes(item));
}
contains('yo-yo', items, function(object){
console.log(object);
})
/* STRETCH PROBLEM */
// let studentsArray = ["Austen", "Austin", "Ryan", "Ryan", "Edd", "Brent", "Britt", "Jazmyne", "Dan"]
// removeDuplicates removes all duplicate values from the given array.
// sumNums adds two numbers (x, y) and passes the result to the callback.
// Pass the duplicate free array to the callback function.
// Do not mutate the original array.