JavaScript Data Types and Operators

Study Notes

JavaScript has two types of data types: Primitive and Non-primitive (Reference) data types.

Arrow functions were introduced in ES6 and allow for shorter function syntax
An arrow function consists of three parts:
- Parameters: optional function parameters
- Fat arrow notation/lambda notation: the notation for the arrow (=>)
- Statements: the instruction set of the function

Conditional statements are used to decide the flow of execution based on different conditions
There are several types of conditional statements in JavaScript:
- if: specifies a block of code to be executed if a specified condition is true
- else: specifies a block of code to be executed if the same condition is false
- else if: specifies a new condition to test if the first condition is false
- switch: specifies many alternative blocks of code to be executed

Loops are used to iterate a piece of code using for, while, do while, or for-in loops
JavaScript supports different kinds of loops:
- for: loops through a block of code a number of times
- for/in: loops through the properties of an object
- for/of: loops through the values of an iterable object
- while: loops through a block of code while a specified condition is true
- do/while: also loops through a block of code while a specified condition is true

A JavaScript function is a block of code designed to perform a particular task
JavaScript functions are used to perform operations and have several advantages:
- Code reusability: can be called multiple times
- Less coding: makes the program more compact

There are two main types of functions in JavaScript:
- Named Functions (Function Declarations): a function with a name that can be used as a callback
- Anonymous Functions (Function Expressions): a function without a name, often used as a one-time callback