Why do arrow functions not have the arguments array? [duplicate]

Question

function foo(x) {    console.log(arguments) } //foo(1) prints [1] 

but

var bar = x => console.log(arguments)  

gives the following error when invoked in the same way:

Uncaught ReferenceError: arguments is not defined 

Answer 1

Arrow functions don't have this since the arguments array-like object was a workaround to begin with, which ES6 has solved with a rest parameter:

var bar = (...arguments) => console.log(arguments); 

arguments is by no means reserved here but just chosen. You can call it whatever you'd like and it can be combined with normal parameters:

var test = (one, two, ...rest) => [one, two, rest]; 

You can even go the other way, illustrated by this fancy apply:

var fapply = (fun, args) => fun(...args);