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What is Parser?

A Parser or Syntax Parser is a program that reads code line-by-line. It understands how the code fits the syntax defined by the Programming Language and what it (the code) is expected to do.

JavaScript Engine

A JavaScript engine is simply a computer program that receives JavaScript source code and compiles it to the binary instructions (machine code) that a CPU can understand. JavaScript engines are typically developed by web browser vendors, and each major browser has one. Examples include the V8 engine for Google Chrome, SpiderMonkey for Firefox, and Chakra for Internet Explorer.

How JavaScript Code Gets Executed

The browser doesn't natively understand the high-level JavaScript code that we write in our applications. It needs to be converted into a format that the browser and our computers can understandmachine code. While reading through HTML, if the browser encounters JavaScript code to run via atag or an attribute that contains JavaScript code like onClick, it sends it to its JavaScript engine. The browsers JavaScript engine then creates a special environment to handle the transformation and execution of this JavaScript code. This environment is known as the Execution Context.

JavaScript Execution Context

The environment that enables the JavaScript code to get executed is called JavaScript Execution Context. This environment is created by the browser's JavaScript engine. It is the execution context that decides which code section has access to the functions, variables, and objects used in the code. During text, the specific code gets parsed line by line then the variables and functions are stored in the memory.

1. Primitive Types

• String: Represents a series of characters and is written with quotes. Can be single or double quotes.

  Example: typeof "John Doe" returns "string"

• Number: Represents a numeric value, with or without decimals.

  Example: typeof 3.14 returns "number"

• BigInt: Used to store large integers, represented by adding "n" to an integer literal.

  Example: typeof 234567890123456789012345678901234567890n returns bigint

• Undefined: Represents a variable that has been declared but not assigned a value.

  Example: typeof undefined returns "undefined"

• Null: Represents a deliberate non-existent or invalid value.

  Example: typeof null returns "object" (this is considered a bug in JavaScript)

• Symbol: Introduced in ES6, used to store unique and anonymous values.

  Example: typeof Symbol('symbol') returns Symbol

Loops

2. for...in Loop

The for...in loop iterates over the properties of an object. For each property, the code in the code block is executed.

Syntax:

OOPS

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Classes in JavaScript

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What is DOM in JavaScript

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