each

Each

f'y
x f'y

each, also known as map, is used to apply a function to all elements of an array y.

When given two arguments and dyadic f, acts as a zip or each dyad adverb, applying f between each element of x and y. The two arrays must be equal in length.

If x is an atom, it will be repeated for each element in y.

 {2*x}'5 7 2
10 14 4

 1 2 3{x,y}'3 4 5
(1 3
 2 4
 3 5)

 (5),'1 3 4
(5 1
 5 3
 5 4)

Each generalizes to multiple arguments and n-adic functions:

 {x+y-z}'[1 2 3;4 5 6;7 8 9]
-2 -1 0