Quick references for fundamental things in JavaScript.

👉 Reading: You Don't Know JS Yet 1 - Get Started

Miscellaneous

• Using // for 1 line comment, /* */ for multi-line comment.
• End of each command by ;.
• Variables and function name are case sensitive.
• Variables / functions should be named in the form of nameOfVariable.
  • Naming a constant: const FAV_PET = 'Cat';.
  • UpperCamelCase should be used by convention for ES6 class names.
• Using \\\\ for special characters, for example, \\\\" for a " inside a "".
• '' can be used inside a "" and vice versa.

Practice directly on the browser

Open the browser (I use Chrome), press F12 to open the Inspect window, then choose tab Console. Now, you can practice on this console window, for example, try with 1+1 and press Ent.

ES6

• "ES" = "ECMAScript" ~ "Javascript".
• Most of browsers use ES6 but not all.
• ES6 = ES2015
• JS timeline.
• New features: Arrow functions, Classes, Modules, Promises, Generators, let and const.
• Read more about ES6 on w3schools.

Concise things

// Concise Object Literal Declarations
const getMousePosition = (x, y) => ({ x, y });