两个函数对等 很好的说明了maped

function r_color x =

x.wireColor = random (color 0 0 0) (color 255 255 255)

for i in selection do
 r_color i

mapped function rand_color x =

x.wireColor = random (color 0 0 0) (color 255 255 255)
rand_color $

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