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functions.js
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66 lines (46 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
*/
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!"
*/
add = (a,b) => {
return a+b;
}
multiply = (a,b) => {
return a*b;
}
greeting = (firstName,lastName) => {
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 ====
// Question 1: Explain in your own words why the example below is a closure.
// Explanation:
// Is closure since inside myFunction we are accessing an external and global variable 'external'
// and nestedFunction is accessing a outer variable called 'internal'
// 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();