What is () => ?

[Ömer]

What is the () => sign ? I see it on examples. Is it used for only pseudo-code purposes or is it used in code? What it means? I cannot search it on google. 

maybeSync(true, () => {       
     foo();     
});     
bar(); 

Thanks in advance..

[Scott González]

That's an arrow function. You can read about it on MDN: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions

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[Miike Ramos]

Hi. () => {} is shorthand for:

function() {

 ...

}

It's syntax you will see in ECMAScript 6. You can learn more about the new syntax at https://babeljs.io/ and start writing the future of JavaScript today!

--

[Joshua Holbrook]

> Hi. () => {} is shorthand for:

Possibly being pedantic, but I think it's important to point out that
there are significant and relevant differences in behavior wrt the
'this' keyword (meaning it's not strictly a shorthand). The MDN
article speaks to this. (heh. this.)

--Josh

> https://groups.google.com/d/msgid/nodejs/CALPwyBTt%3DV2-jKOYsnf0%2BjPyaewqYNDX82Nx%2Bohvypfn%2BUupSQ%40mail.gmail.com.

[jerome]

Also worth taking note of the optional implicit return value afforded by "fat arrow functions".

e.g.

(data) => data

That kind of thing.