TypeScript Primitives: String, Number, and Boolean Type

TypeScript provides a set of basic data types that form the foundation for writing reliable and structured code. These primitive types help ensure values are used consistently and correctly in a program.

TypeScript Primitive DataTypes

Similar to JavaScript's mostly used data types TypeScript has mainly 3 primitives

1. String Type

The string data type represents text or sequences of characters. Strings are enclosed in single or double quotes in JavaScript and TypeScript.

Syntax

let variableName: string = "value";

In the above syntax:

• variableName: This is the name of the variable.
• string: This is the type annotation specifying that the variable should store a string.
• "value": This is the initial value assigned to the variable.

Example: In this example, we will learn about string

let gfg: string = "GeeskforGeeks";
console.log(gfg)

Output:

2. Number Type

The number data type represents numeric values, both integers and floating-point numbers.

Syntax

let variableName: number = numericValue;

In the above syntax:

• variableName: This is the name of the variable.
• number: This is the type annotation specifying that the variable should store a numeric value (integer or floating-point).
• numericValue: This is the initial numeric value assigned to the variable.

Example: In this example, we will learn about number

let num: number = 30;
let float: number = 19.99;
console.log(num)
console.log(float)

Output:

3. Boolean Type

The boolean data type represents a binary value, which can be either true or false. It is often used for conditions and logical operations.

Syntax:

let variableName: boolean = true | false;

In the above syntax:

• variableName: This is the name of the variable.
• boolean: This is the type annotation specifying that the variable should store a boolean value, which can be true or false.
• true or false: These are the initial boolean values assigned to the variable

Example: In this example, we will learn about boolean

let isStudent: boolean = true;
let hasPermission: boolean = false;
console.log(isStudent)
console.log(hasPermission)

Output:

21mcsrltd

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• TypeScript
• Geeks Premier League 2023