Identifiers and Keywords in TypeScript

In TypeScript, identifiers are names used for variables, classes, or methods and must follow specific naming rules. Keywords are reserved words with predefined meanings and cannot be used as identifiers. Comments, both single-line and multi-line, enhance code readability and are ignored during code execution.

Identifiers

Identifiers are nothing but the names given to any class members like a variable, method name, class name, array name, etc. Certain rules to be followed while declaring Identifiers:

• Identifier names can start with both upper-case as well as lower-case letters but can't start with numbers.
• Only _ and $ symbols can be used for giving names to Identifiers, apart from these symbols, no other special symbol can be used.
• Keywords are different from Identifiers.
• The identifier is case-sensitive and doesn't contain spaces.

Examples of Valid and Invalid Identifiers:

Keywords:

Keywords are words which are responsible to perform some specific task or the words which represent some specific functionality. The following table lists some keywords:

Comments:

Comments are a way to improve the readability of a program. While coding we use comments for a better understanding of code for other users. While execution of the code, compiler ignore the comments and compile the rest of the code. There are two ways to use comments :

• Single-line comments ( // )
• Multi-line comments (/* */)

Examples:

Hello World in TypeScript