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functions.js
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63 lines (45 loc) · 1.75 KB
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// ==== Callbacks ====
/* Step 1: Create a function that accepts a callback
* 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 (param1, param2, cb) {
return cb(param1, param2);
}
/* 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 (num1, num2) {
console.log(num1 + num2);
return num1 + num2;
}
function multiply (num1, num2) {
console.log(num1 * num2);
return num1 * num2;
}
function greeting(firstName, lastName) {
console.log(`Hello ${firstName} ${lastName}, nice to meet you!`);
return `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 ====
// Explain in your own words why `nestedfunction()` can access the variable `internal`.
// Explanation:
// Because nestedfunction() has access to that variable because they are within the same scope.
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();