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90 lines (70 loc) · 2.23 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', 2, 3, 3, 3, 5, 6];
/*
//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)
});
*/
// call back function
const callback = val => console.log(val);
function getLength(arr, cb) {
// getLength passes the length of the array into the callback.
let arrLength = arr.length;
return cb(arrLength);
}
// Function invocation
getLength(items, callback);
function last(arr, cb) {
// last passes the last item of the array into the callback.
let lastItem = arr[arr.length-1];
return cb(lastItem);
}
// Function invocation
last(items, callback);
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);
}
// Function invocation
sumNums(5, 3, callback);
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
let product = x * y;
return cb(product);
}
// Function invocation
multiplyNums(5, 8, callback);
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 (list.includes(item)) {
cb(true)
} else {
cb(false)
}
}
// Function Invocation
contains('Gum', items, callback);
/* 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.
let unique = [...new Set(array)];
return cb(unique);
}
// Function Invocation
removeDuplicates(items, callback);