apply

apply(v,f) -- applies the function f to each element of the list v, returning the list of results. If v is a sequence, then a sequence is returned.

i1 : apply(1 .. 5, i->i^2)



o1 = (1, 4, 9, 16, 25)



o1 : Sequence

i2 : apply({1,3,5,7}, i->i^2)



o2 = {1, 9, 25, 49}



o2 : List

apply(v,w,f) -- produces, from lists or sequences v and w, a list z in which the i-th element w_i is obtained by evaluating f(v_i,w_i). If v and w are lists of the same class, then the result is also of that class. If v and w are sequences, then so is the result.

i3 : apply(1 .. 5, a .. e, identity)



o3 = ((1, a), (2, b), (3, c), (4, d), (5, e))



o3 : Sequence

i4 : apply({1,3,5,7}, i->i^2)



o4 = {1, 9, 25, 49}



o4 : List

apply(n,f) -- equivalent to apply(list (0 .. n-1),f), for an integer n.

See also scan, select, any, all, and member.

apply(x,f) -- produces a new hash table y from an hash table x by applying the function f to each of the values of x. This means that if x#k === v then y#k === f(v).

See also List / Function and Function \ List.