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92 lines (73 loc) · 2.18 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[arr.length-1]);
}
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.
const sum = x+y;
return cb(sum);
}
sumNums(3, 6, function(sum) {
console.log(sum);
});
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
const product = x*y;
return cb(product);
}
multiplyNums(3, 6, function(product) {
console.log(product);
});
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) == true) {
return cb(true);
} else {
return cb(false);
}
}
contains('Notebook', items, function(included) {
console.log(included);
});
/* 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 newArr = [];
for (let i=0; i<array.length; i++) {
if (!newArr.includes(array[i])) {
newArr.push(array[i]);
}
}
return cb(newArr);
}
removeDuplicates(items, function(items) {
console.log(items);
});