ES6 terminology
===
### A
- **arrays**: store multiple values in a single variable.
- **arrow functions** allow us to write shorter function syntax:
### B
### C
### D
- **data type**:
- - **primitives**:
- - Boolean
Null
Undefined
Number
String
Symbol

### E
### F
- **function**: block of code designed to perform a particular task.
### G
### H
- **hoisting**: moving declarations to the top.
### I
### J
### K
### L
### M
### N
### O
- **object**: set of key value pairs.
- **events**: are the part of every HTML element that contains a set of events that can trigger the JavaScript code
### P
### Q
### R
### S
- **scope**: accessibility (visibility) of variables.
- - Local scope - inside function
- - Global scope - outside function
- **strict mode**: not allowed you can not, for example, use undeclared variables
### T
- **this**: keyword refers to parent object.
### U
### V
- **variables**: containers for storing data values.
### W
### X
### Y
### Z

Interview Questions
===

#### 1.Two programming paradigms important for JavaScript?
- Prototypal inheritance (also: prototypes, OLOO (objects linked to other objects) pattern).
- Functional programming (also: closures, first class functions, lambdas).
#### 2. What is functional programming?
- Functional programming is an concept in JavaScript (one of the two pillars of JavaScript).
- Pure functions (same input, will always return the same output. function plus(x, y) { return x + y; })
- Avoid side-effects (A "side effect" is any effect other than return value.
function plusWithSideEffects(x, y) { alert("This is a side effect"); return x + y; } )
- First-class functions (can be assigned to a variable, passed as an argument, returned from other function)
- Higher order functions (A Higher-Order function is a function that receives a function as an input argument or returns a function as output.)
#### 3. What is the difference between classical inheritance and prototypal inheritance?
- Class Inheritance: create new instance
- Prototypal Inheritance: create reference to parent object
#### 4. JavaScript OOP vs Functional
- In OOP, an object is a box containing informations and operations that refer to the same concept.
- Informations are often known as "attributes", and operations are often known as "methods".
- In FP, the code is essentially a combination of functions. Avoid side effect.
#### 5. When is classical inheritance an appropriate choice?
- Never
#### 6. When is prototypal inheritance an appropriate choice?
- Any time you need inheritance.
#### 7. What are two-way data binding and one-way data flow, and how are they different?
- Two-way: if you change UI field, model data is changed as well.
- One-way: only model can be changed.
#### 8. What is asynchronous programming, and why is it important in JavaScript?
- Asynchronous programming means that the engine runs in an event loop.
In this way, a single program thread can handle many concurrent operations.

#### 9. Explain event delegation.
- Event delegation allows you to avoid adding event listeners to specific nodes. Instead, the event listener is added to one parent. That event listener analyzes bubbled events to find a match on child elements.
#### 10. Explain how prototypal inheritance works
-