Arrow function without curly braces

Question

I\'m new to both ES6 and React and I keep seeing arrow functions. Why is it that some arrow functions use curly braces after the fat arrow and some use parentheses? For exam

Answer 1

One can also use curly braces to prevent a single line arrow function from returning a value -- or to make it obvious to the next developer that a single line arrow function shouldn't, in this case, be returning anything.

For example:

const myFunc = (stuff) => { someArray.push(stuff) }
const otherFunc = (stuff) => someArray.push(stuff)

console.log(myFunc())    // --> logs undefined
console.log(otherFunc()) // --> logs result of push which is new array length