Proc in Ruby

Blocks are one of the very few exceptions to the “everything is an object” rule in Ruby. Blocks are not objects, and they can’t be saved to variables.

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Example code for Proc.

def foo(a, b, my_proc)
    my_proc.call(a, b)
end

add = proc {|x, y| x + y}

puts foo(15, 10, add)
output: 25

In this example, we have created the proc add, which adds two numbers.
The proc add is passed as a parameter to the method foo.
In the method foo, my_proc.call(a, b) executes the proc.