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functions.js
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60 lines (46 loc) · 2.24 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
*/
console.log("================================================functions.js =====================================================================")
function consume(argOne, argTwo, callBack) {
return callBack(argOne, argTwo);
}
/* 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) {
return num1 + num2;
}
function multiply(num1, num2) {
return num1 * num2;
}
function greeting(firstName, lastName) {
return `Hello ${firstName} ${lastName}, 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:
// the nested Function can have access to the variable inernal because any variable in the outer scope of that function is accessible and
// calling it or using is totally valid. the lexical environement that the function was declared it allows it to reach them.
// whemn the nestedfunction is called or invoked, it will try to log out the internal but because it is not defined within its scope, the function
// will reach outward and look for it as long as the function is nested within another one.
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();