The function creates a new function that adds a delay in milliseconds to the execution of another function that is passed as an argument.

gistfile1.txt

function addDelay(func: () => void, ms: number) {
    return () => {
        setTimeout(() => {
            func();
        }, ms);
    };
}

function sayHello() {
    console.log('Hello world!');
}

const delayedSayHello = addDelay(sayHello, 600);
delayedSayHello(); // Prints "Hello world!" (after 600 ms)