Calling/applying lambda vs. function call - the syntax in Ruby is different. Why?

Question

I am kinda new to Ruby and still trying to understand some of the language design principles. IF I\'ve got it right, the lambda expression call in Ruby must be with square brace

Answer 1

If you want brackets, you can do

by_two = lambda { |x| x * 2 }
by_two.(5) # => 10

Note the . between by_two and (5).