> console.log(...[1,2,3])
< 1 2 3 

> console.log(...[1,2,[4,5],3])
< 1 2 (2)?[4, 5] 3

> function a(e,...args){console.log(e,args)}
> a(1,2,4,5)
< 1 (3)?[2, 4, 5]

> function f(x,y,z){console.log(x,y,z)}
> f(...[1,2,3])
< 1 2 3