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callbacks.js
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67 lines (52 loc) · 1.4 KB
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const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum', 'yo-yo'];
function firstItem(arr, cb) {
// firstItem passes the first item of the given array to the callback function.
cb(arr[0]);
}
firstItem(items, function(first) {
console.log(first);
});
function getLength(arr, cb) {
// getLength passes the length of the array into the callback.
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.
cb(arr[arr.length - 1]);
}
last(items, function(lastItem) {
console.log(lastItem);
});
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
cb(x + y);
}
sumNums(10, 15, function(total) {
console.log(total);
});
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
cb(x * y);
}
multiplyNums(10, 15, function(total) {
console.log(total);
});
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; i < list.length; i++) {
if (list[i] === item) {
return cb(true);
}
}
return cb(false);
}
contains('Bats', items, function(flag) {
console.log(flag);
});
contains('Notebook', items, function(flag) {
console.log(flag);
});