Discussion on: An Overview of JavaScript Functions

[Alex Lohr]

The syntax _=>... will take an argument _ and is not special in any way, since the underscore is considered a normal variable name character. You could also write a=>... to the same effect.

To prove there is no difference, try the following:

(_=>{}).length // 1
(a=>{}).length // 1
(()=>{}).length // 0

[HowToCodejs]

Thanks for the heads up!