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Whenever a variable is created, the intention is to assign some value to the variable, but what type of value can be assigned to the variable depends on the data type of the variable. In typeScript, type System represents the different types of data types supported by typeScript. Data types are classified as follows:
Built-in data types: TypeScript has some predefined data types-
| Built-in data type | Keyword | Description |
| Number | Number | It is used to represent integers and floating point numbers |
| Boolean | Boolean | Represents true and false |
| String | String | It is used to represent a sequence of characters |
| Void | Void | Usually used for function return types |
| Null | Null | Use it when the object does not have any value |
| Undefined | Undefined | Indicates the value of an uninitialized variable |
| Any | Any | If you declare a variable using the Any data type, you can assign any type of value to the variable |
Example:
let a: null = null; let b: number = 123; let c: number = 123.456; let d: string = ‘Geeks’; let e: undefined = undefined; let f: boolean = true; let g: number = 0b111001; // 二进制 let h: number = 0o436; // 八进制 let i: number = 0xadf0d; // Hexa-Decimal
User-defined data types: In addition to built-in data types, users can also customize data types. User-defined types include enums, classes, interfaces, arrays, and tuples.
Note: Among the built-in data types, any is a special data type and the super data type of all data types. If we declare a variable with any data type, then we can assign any type value to the variable.
Example:
let a: any = null; let b: any =123; let c: any = 123.456; let d: any = ‘Geeks’; let e: any = undefined; let f: any = true;
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