What is Javascript?
JavaScript is a versatile , high-level programming language used to create interactive and dynamic content for websites.
It is a lightweight, cross-platform, and single-threaded programming language.
It's an interpreted language that executes code line by line, providing more flexibility.
Development History
- Developer: Brendan Eich.
- Company: Netscape Communications.
- Year: 1995.
- Original Name: Mocha (later renamed LiveScript, then JavaScript).
- Standard: Managed by ECMA International as ECMAScript.
Features
- Interpreted - Browsers read and run the code directly without pre-compilation.
- Client-Side - Runs inside the user's web browser to reduce server load.
- Dynamic Typing - Variables can hold any data type without strict definitions.
- Event-Driven - Responds to user actions like clicks, scrolls, and keystrokes.
- Cross-platform – It can run in different browsers and operating systems.
- Object-Oriented - Uses prototypes to copy and extend object behaviors.
JIT stands for Just-In-Time
A JIT compiler converts JavaScript code into machine code during runtime, so the computer can execute it efficiently.
Modern JavaScript engines use a combination of interpretation and JIT compilation to execute JavaScript.
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