reading-notes

JavaScript Basics

JavaScript Types

• Number ex. 5
• String ex. “5”

  Note: to change string to number use: Number(first)

• Boolean ex. True

Basic Commands

• alert (“message”);

  a pop up box with a message on the website with no input

• console.log();

  shows info in the developer console

• document.write();

  puts new content on the HTML page

• prompt ();

  gets info from the user

JavaScript Comparisons:

• === Exactly equal to
• !== Does not equal

Variables

• A container for data
• Must start with a letter, $, _
• Can end in a number
• Use camel casing ex. camelCase
• Expression end with a ;
• Can hold string, boolean & numbers ex.

Number: var a = 4;

String: var a = “four”;

Boolean: var a = True;

Variable Declarations:

• let
• const