Sha256: 1b4c5ef5211a4771df044b6c8cefe91847640634d5888826e92ac84b2ebbc646
Contents?: true
Size: 789 Bytes
Versions: 7
Compression:
Stored size: 789 Bytes
Contents
class Proc
# Returns a new proc that is the functional
# composition of two procs, in order.
#
# a = lambda { |x| x + 4 }
# b = lambda { |y| y / 2 }
#
# a.compose(b).call(4) #=> 6
# b.compose(a).call(4) #=> 4
#
# CREDIT: Dave
def compose(g)
raise ArgumentError, "arity count mismatch" unless arity == g.arity
lambda{ |*a| self[ *g[*a] ] }
end
# Operator for Proc#compose and Integer#times_collect/of.
#
# a = lambda { |x| x + 4 }
# b = lambda { |y| y / 2 }
#
# (a * b).call(4) #=> 6
# (b * a).call(4) #=> 4
#
# CREDIT: Dave
def *(x)
if Integer===x
# collect times
c = []
x.times{|i| c << call(i)}
c
else
# compose procs
lambda{|*a| self[x[*a]]}
end
end
end
Version data entries
7 entries across 7 versions & 2 rubygems