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callbacks.js
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107 lines (76 loc) · 2.4 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)
});
*/
// Length of the array
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);
});
// Last item of the array
function last(arr, cb) {
return cb(arr[arr.length -1]);
// last passes the last item of the array into the callback.
}
last(items, function(lastItem) {
console.log(lastItem);
});
// Adds two numbers
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
return cb(x+y);
}
sumNums(5, 6, function (add) {
console.log(add);
});
// Multiplies two numbers
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
return cb(x*y);
}
multiplyNums(5, 6, function (multiply) {
console.log(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.
for (let i=0; list.length > i; i++) {
if (list[i] === item) {
return cb(true);
}
}
return cb(false);
}
contains('Notebook', items, function (ifPresent) {
console.log(ifPresent);
});
/* STRETCH PROBLEM */
function removeDuplicates(array, cb) {
let noDuplicates = new Set(array);
let result = Array.from(noDuplicates);
return cb(result);
// removeDuplicates removes all duplicate values from the given array.
// Pass the duplicate free array to the callback function.
// Do not mutate the original array.
}
removeDuplicates(items, function(result) {
console.log(result);
})
// const items2 = ['Pencil', 'Notebook', 'yo-yo', 'Gum', 'Notebook', 'Pencil'];
// removeDuplicates(items2, function(result) {
// console.log(result);
// })