Introduction

JS is a high level OOP (Object Oriented Programming) language, which means many of the same programing paradigms you are familiar with in other languages (like Python) have a beautiful JS equivalent. Thus, we've created this nifty 1 to 1 guide to help get you up in running in JS.

The Basics

Variables

• There are two ways to declare a variable in JS: using (1) const when the variable doesn't change and (2) using let when the variable does change. Also, you might see 'var' in older JS scripts. It's usually safe to assume that var can be replaced with let when reading the scripts however there are some subtle differences - read up on them here if you are interested.
• We use camelCase in JS for 'let' variables. It's also common to see const variables in all caps when referencing immutable data types.

im_a_variable = 1;

const UNCHANGING = "I don't change";
const myFunc = (a) => (a + 1);
let iCanChange = 1;

Comments

# Go ahead, make my day.
"""
Go ahead, 
make my day.
"""

// That's my secret, I'm always angry.
/* 
That's my secret, 
I'm always angry.
*/

Console

print("I feel the need - the need for speed!")
>>> I feel the need - the need for speed!

console.log("I feel the need - the need for speed!");
>>> I feel the need - the need for speed!

Whitespace

• We don't use whitespace like tabs and spaces to break up statements, since JavaScript doesn't care about most whitespace, instead we use semicolons. While you can use semicolons in pretty much the same way as Java, there are a few edge cases that differ. While JS does automatic semicolon insertion, it is suggested to still use semicolons after every statement.

def fn1():
	return 0
fn1()
fn2()

function fn1() { return 0; }
fn1(); fn2();

Logical operators

a = True and False
b = True or False 
c = not True