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52 lines (42 loc) · 1.71 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
*/
const consume = function(x, y, cb){
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!"
*/
const add = function(one,two) {
console.log(one + two)
}
const multiply = function(three,four) {
console.log(three * four);
}
const greeting = function (firstname, lastname){
console.log(`Hello ${firstname} ${lastname}, nice to meet you!`);
}
/* Step 3: Check your work by uncommenting the following calls to consume(): */
consume(2,2,add); // 4
consume(10,16,multiply); // 160
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: its a function within a function. it also takes a variable within the parent function and uses it in the child function.
// Question 2: Given the example below, what scope is the external variable in? global scope.
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();