Values

Values

Fixed

Literal

: Numbers - decimals optional : Strings - single or double quoted

Variable

Variable

: Name of storage locn where data is stored

Comments

Line: // Line Comment

Block: /* Anything between these */

Data Types

Primitive Data Types

let x = 3; // Number Data Type
let result = "PASS"; // String
let testPassed = true; //Boolan
let noDefault = null; // Null
let noDefault; // Undefined
let flagvar = Symbol("PASS"); // Symbol
LET foodPrice = BigInt("0f10111111"); // Bigint

Non-Primitive (Ref) Data Types

• derived from primitive data types
• references
• maths, functions, dates, arrays, maps, sets

let importantObj = {}; // Object
let importantObj new Object(); // Object
let colors = ["red", "yellow", "green"]; // Array Data Type
let book = { // Object Data Type
    title: "JavaScript Programming",
    ISBN: "978-3-16-148410-",
    author: "John Doe",
    price: 25.99
}

Functions

function functionName( arg1, arg2, arg3) {
    // Logic
    let x = 0;
    console.log(x);
    return x;
}
functionName(); //execute

see functions.

Identifiers

• used to name variables, keywords,and functs
• begin with letter, $ or _
• case Sensitive, camelCase

Char Set

• e.g., unicode UTF-8
• chars, punctuation and symbols