Basic types

In a programming language, we deal with various small units of data, such as numbers, sting, and Boolean values. TypeScript supports these types of data, as in JavaScript, with enumeration and structure types.

Boolean

The boolean data type can hold either true or false. Declaring and initializing this data type is quite easy and is illustrated as follows:

let isSaved: boolean = false; 

Here, the isSaved variable is declared as boolean and is assigned with the value false. If the developer assigns a string value to the isSaved variable by mistake, the TypeScript will show an error and highlight the statement.

Number

The number data type holds floating-point values. Similar to JavaScript, TypeScript considers all numbers as floating-point values. Declaring and initializing the number data type variable can be done as follows:

let price: number = 101; 

Here, the price variable is declared as number and is assigned the value 101. Number type can hold values such as decimal, binary, hexadecimal...