Difference between Implicit and Explicit Data Type

In Type Theory and languages like TypeScript, Basic Explicit Types means you directly specify the data type of a variable instead of letting the language guess it.

Example in TypeScript

let name: string = "Raj";
let age: number = 25;
let isActive: boolean = true;

Here:

• string
• number
• boolean

are explicit types because we manually declared them.

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Why called “Explicit”?

Because the type is written clearly by the developer.

let city: string = "Bangalore";

The type string is explicitly mentioned.

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Opposite: Implicit Type

let city = "Bangalore";

Here TypeScript automatically understands it is a string.
This is called implicit type inference.