JavaScript basic syntax

Syntax basics

JavaScript syntax is the set of rules, conventions, and grammar for writing JavaScript code. A JavaScript program consists of a sequence of statements, which are executed one by one.

let name = "JavaScript";

let price = 10 + 5;

Variables

Variables let you store values by giving them a name. You can use var, let, or const to declare a variable.let and const are block-scoped, while var is function-scoped.

let score = 10;

const PI = 3.14;

Data types

JavaScript has dynamic types. A value's type is determined at runtime. The main types are: number, string, boolean, null, undefined, object, and symbol.

let type = typeof "hello";

console.log(type);

Strings

Strings are sequences of characters, stored as primitives. You can use single quotes, double quotes, or template literals (backticks) with embedded expressions.

let first = "Hello";

let greeting = `Hello, ${name}`;

Next: Variables and data types

Article author: Arthur Isaev