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57 lines (44 loc) · 1.91 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(parameterOne, parameterTwo, callback) {
return callback(parameterOne, parameterTwo);
}
/* 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);
}
function multiply(num1, num2) {
console.log( num1 * num2);
}
function greeting(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 ====
// Explain in your own words why `nestedfunction()` can access the variable `internal`.
/* A closure is an inner function that has access to the outer (enclosing) function's variables—scope chain.
As nestedFunction() is an function inside myFunction(). nestedFunction() will have access to variables declared in outer function which
is here myFunction().. so 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();