TypeScript - create generic function

In this article, we want to show how to create generic function type in TypeScript.

Quick solution:

const print = <T extends unknown> (value: T): void => {
    // ...
};

or:

function print<T extends unknown> (value: T): void {
    // ...
}

Practical examples

Example 1:

const print = <T extends unknown> (value: T): void => {
    console.log(value);
};


// Usage example:

print(true);         // true
print(3.14);         // 3.14
print('Hi there!');  // Hi there!

Example 2:

function print<T extends unknown>(value: T): void {
    console.log(value);
}


// Usage example:

print(true);         // true
print(3.14);         // 3.14
print('Hi there!');  // Hi there!