Typescript Expression Function

Typescript expression function

Created By: chatGPT

TypeScript provides a powerful way to define functions using expression syntax. An expression function can be created using arrow functions, which offer a more concise syntax and maintain the context of this. Here’s how you can define an expression function in TypeScript.

const add = (a: number, b: number): number => {
    return a + b;
};

The above function add takes two parameters, a and b, both of type number, and returns their sum. Arrow functions are particularly useful for when you need to maintain the this context naturally.

const multiply = (a: number, b: number): number => a * b;

For single-line functions, you can omit the braces and the return keyword. In this case, the function multiply multiplies two numbers without explicit return statements.

const logResult = (result: number): void => console.log(`The result is: ${result}`);

In TypeScript, you can also specify the return type. For instance, the logResult function takes a number and returns void, meaning it does not return any useful value, but instead performs an action like logging the output to the console.

const getGreeting = (name: string): string => `Hello, ${name}!`;

This getGreeting function takes a string parameter name and returns a greeting message as a string. Type inference in TypeScript means that if you do not specify the return type, TypeScript will try to infer it automatically.

const square = (x: number): number => x * x;

Here, the square function takes a number x as an input and returns its square. This shows how TypeScript can help enforce types on our functions, leading to more robust and maintainable code.