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functions.js
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60 lines (44 loc) · 1.64 KB
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// ==== Callbacks ====
/* Step 1: Create a callback function
* Create a function named consume that can take 3 parameters.
* The first two parameteres can accept any argument
* The last parameter accepts a callback
* In the body of the function return the callback with the two parameters that you created
*/
function consume(x, y, cb) {
return cb(x, y);
}
/* 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(x , y) {
return x + y;
}
function multiply(x, y) {
return x * y;
}
function greeting(firstName, lastName) {
return `Hello ${firstName} ${lastName}, nice to meet you!`;
}
/* Step 3: Check your work by uncommenting 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 ====
// Question 1: Explain in your own words why the example below is a closure.
// Explanation:
// There's a function nested inside a function and with a global invocation.
// Question 2: Given the example below, what scope is the external variable in?
// global
let external = "I'm outside!";
function myFunction() {
let internal = "Hello! I'm inside the function";
console.log(external);
function nestedFunction() {
console.log(internal);
};
nestedFunction();
}
myFunction();