Javascript: Call a function after specific time period

Question

In JavaScript, How can I call a function after a specific time interval?

Here is my function I want to run:

function FetchData() {
}

user_15071778 · Answer

ECMAScript 6 introduced arrow functions so now the setTimeout() or setInterval() don't have to look like this:

setTimeout(function() { FetchData(); }, 1000)

Instead, you can use annonymous arrow function which looks cleaner, and less confusing:

setTimeout(() => {FetchData();}, 1000)

user_931247 · Answer

setTimeout(() => {
   console.log('Hello Timeout!')
}, 3000);

setInterval(() => {
   console.log('Hello Interval!')
}, 2000);