Identifiers and Keywords in TypeScript
Identifiers: Identifiers are nothing but the names which is given to the members of any class like a variable, method name, class name, array name etc. Certain rules to be followed while declaring Identifiers:
- Identifier name can start with both upper-case as well as lower case letter but can’t start with numbers.
- Only _ and $ symbols can be used for giving name to Identifiers, apart from these symbols, no other special symbol can be used.
- Keywords are different from Identifiers.
- Identifier are case sensitive and doesn’t contain spaces.
Examples of Valid and Invalid Identifiers:
Valid |
Invalid |
geeksforgeeks |
1$geeksforgeeks |
geeks_for_geeks |
#geeks |
$geeks |
geeks-for-geeks |
_geeks$ |
any |
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:
break |
as |
any |
switch |
case |
if |
throw |
else |
var |
number |
string |
get |
module |
type |
instanceof |
typeof |
public |
private |
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
Last Updated :
19 Feb, 2019
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