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callbacks.js
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103 lines (76 loc) · 2.54 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)
});
*/
////////////////////////////////////////////////////////////
/////////////// QUESTION 1
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);
});
////////////////////////////////////////////////////////////
/////////////// QUESTION 2
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);
});
////////////////////////////////////////////////////////////
/////////////// QUESTION 3
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
return cb(x + y);
}
sumNums(2, 3, function(sum) {
console.log(sum);
});
////////////////////////////////////////////////////////////
/////////////// QUESTION 4
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
return cb(x * y);
}
multiplyNums(2, 3, function(total) {
console.log(total);
});
////////////////////////////////////////////////////////////
/////////////// QUESTION 5
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.
return cb(item, list);
}
function check(x, y) {
for (let i = 0; i < y.length; i++) {
if (x === y[i]) {
return true;
} else {
return false;
}
}
}
contains("word", items, check(x, y));
////////////////////////////////////////////////////////////
/////////////// /* STRETCH PROBLEM */
const items2 = ["Pencil", "Notebook", "yo-yo", "Gum", "Notebook", "yo-yo"];
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.
}