Question

Please help as soon as you can Thnx!

// ==== Callbacks ====

/* Step 1: Create a higher-order function

* Create a higher-order function named consume with 3 parameters: a, b and cb

* The first two parameters can take any argument (we can pass any value as argument)

* The last parameter accepts a callback

* The consume function should return the invocation of cb, passing a and b into cb as arguments

*/

/* Step 2: Create several functions to callback with consume();

* Create a function named add that returns the sum of two numbers

* Create a function named multiply that returns the product of two numbers

* Create a function named greeting that accepts a first and last name and returns "Hello first-name last-name, nice to meet you!"

*/

/* Step 3: Check your work by un-commenting the following calls to consume(): */

// console.log(consume(2, 2, add)); // 4

// console.log(consume(10, 16, multiply)); // 160

// console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice to meet you!

// ==== Closures ====

// Explain in your own words why nestedfunction can access the variable internal.

// Explanation:

const external = "I'm outside the function";

function myFunction() {

console.log(external);

const internal = "Hello! I'm inside myFunction!";

function nestedFunction() {

console.log(internal);

};

nestedFunction();

}

myFunction();

Answer 1

If you have any doubts, please give me comment...

// ==== Callbacks ====

/* Step 1: Create a higher-order function

* Create a higher-order function named consume with 3 parameters: a, b and cb

* The first two parameters can take any argument (we can pass any value as argument)

* The last parameter accepts a callback

* The consume function should return the invocation of cb, passing a and b into cb as arguments

*/

function consume(a, b, cb) {

    return cb(a, b);

}

/* Step 2: Create several functions to callback with consume();

* Create a function named add that returns the sum of two numbers

* Create a function named multiply that returns the product of two numbers

* Create a function named greeting that accepts a first and last name and returns "Hello first-name last-name, nice to meet you!"

*/

function add(a, b) {

    return a + b;

}

function multiply(a, b) {

    return a * b;

}

function greeting(fname, lname) {

    return "Hello " + fname + " " + lname + ", nice to meet you!";

}

/* Step 3: Check your work by un-commenting the following calls to consume(): */

console.log(consume(2, 2, add)); // 4

console.log(consume(10, 16, multiply)); // 160

console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice to meet you!

// ==== Closures ====

// Explain in your own words why nestedfunction can access the variable internal.

// Explanation:

const external = "I'm outside the function";

function myFunction() {

    console.log(external);

    const internal = "Hello! I'm inside myFunction!";

    function nestedFunction() {

        console.log(internal);

    };

    nestedFunction();

}

myFunction();