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functions.js
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57 lines (41 loc) · 1.62 KB
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// ==== Callbacks ====
/* Step 1: Create a higher-order function that accepts a callback
* Create a higher-order function named consume that can take 3 parameters.
* The first two parameters 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, callback) {
return callback(x, y);
}
function add (x, y) {
return x + y;
}
function multiply (x, y) {
return x * y;
}
function greeting(x, y) {
return `Hello ${x} ${y}, nice to meet you!`;
}
/* 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!"
*/
/* Step 3: Check your work by un-commenting 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 ====
// Explain in your own words why `nestedfunction()` can access the variable `internal`.consume("Mary","Poppins", greeting)
// Explanation: It depends on where it was declared. It was declared insided.
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();