Different ways to call a lambda
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my_lambda = -> { puts 'Hello' }
my_lambda.call
my_lambda[]
my_lambda.()
my_lambda.===
Creating a pre-filled array
The Array class can take an argument + a block, which let’s you create an array with n elements. By default these elements are nil, but if you have a block, the values will come from it.
Example:
Array.new(10) { rand 300 }This will generate an array with 10 random numbers which are between 0 and 300.</p>
Convert any value into a boolean
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!!(1) # true
!!(nil) # false