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functions.js
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52 lines (41 loc) · 1.72 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
*/
consume = function(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 = function(param1, param2) {
return param1 + param2;
}
multiply = function(param1, param2) {
return param1*param2;
}
greeting = function(param1, param2) {
return `Hello ${param1} ${param2}, nice to meet you!`;
}
//Step 3: Check your work by un-commenting 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: nestFunction() creates its own scope. The variable internal is not defined in the function's scope, the function will look outside the scope and search for the variable.
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();