macro
boot.janet on line 630 , column 1
(each binding x & body )
Loop over each value in `x` with each value of `x` bound to
`binding` with destructuring support. Returns `nil` .
`x` can be a bytes , indexed , dictionary , fiber , or abstract type
with suitable `get` and `next` methods.
(each item [1 2 3 4 ] (print item ))
# prints 1
# prints 2
# prints 3
# prints 4
# => nil