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functions.js
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58 lines (42 loc) · 1.78 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(a, b, cb) {
return cb(a, b)
}
/* 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(x, y) {
return x + y
}
function multiply(x, y) {
return x * y
}
function greeting(first, last) {
return `Hello ${first} ${last}, 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`.
// Explanation:
// nestedfunction() is nested within myFunction() and therefore has access to the variables in myFunction()'s scope. Another way of saying this is: nestedfunction() lives in myFunction()'s scope so it has access to variables within this scope like "internal".
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();