Javascript

Question 1

What are the 3 main types of Scope?

Answer 1

1. Global Scope
2. Block Scope
3. Function Scope

Question 2

Does map() return a new array?

Answer 2

Yes

Question 3

What is a Higher Order Function?

Answer 3

A higher order function is a function that takes a function as an argument, or returns a function.

Question 4

What is Currying?

Answer 4

Currying is a technique of evaluating a function with multiple arguments, into a sequence of function with a single argument.

In My Words:

Currying is when you take a function with multiple arguments and divide those arguments over multiple functions within the same function.

Question 5

What is closure?

Answer 5

A closure is a feature in JavaScript where an inner function has access to the outer (enclosing) function’s variables — a scope chain.

Question 6

What is Functional Programming?

Answer 6

Is when you use Pure Functions almost exclusively.

Question 7

What is a Pure Function?

Answer 7

1. Given the same input, will always return the same output.
2. Produces no side effects.

Question 8

What is Global Scope?

Answer 8

Global Scope is anything defined outside of any code block.

Question 9

What is Local Scope?

Answer 9

Local Scope is anything defined inside of a code block.

Question 10

Describe map()

Answer 10

The map() method creates a new array of results using a function on each element of the array.