[qaq]

None is preventing you from writing let f = (a,b,c) => {a * b ^ c}; in JS

[1000hz]

when you include curly braces in arrow functions you lose the implicit return, so this function would return undefined

[johnhenry]

You can get the implicit return if you use parentheses instead:

f = (a,b,c) => (a * b ^ c)

[qaq]

very true :)