How can I define/name a block in Ruby?

numbers = 1..10
print numbers.map {|x| x*x}

# I want to do:
square = {|x| x*x}
print 开发者_C百科numbers.map square

Because the syntax is more concise. I there a way to do this without having to use def + end?

square = proc {|x| x**2 }
print number.map(&square)

You cannot assign a block to a variable because a block isn't really an object per se.

What you can do, is assign a Proc object to a variable, and then convert that to a block using the & unary prefix operator:

numbers = 1..10
print numbers.map {|x| x * x }

square = -> x { x * x }
print numbers.map &square

numbers = 1..10
square = lambda{|x| x*x }
numbers.map &square