nil? nil? The pseudo-method nil? determines whether an expression’s runtime type is Nil . For example: a = 1 a . nil ? # => false b = nil b . nil ? ...

is_a? is_a? The pseudo-method is_a? determines whether an expression’s runtime type inherits or includes another type. For example: a = 1 a . is_a ?( Int32 ) #...

is_a? is_a? The pseudo-method is_a? determines whether an expression’s runtime type inherits or includes another type. For example: a = 1 a . is_a ?( Int32 ) #...

is_a? is_a? The pseudo-method is_a? determines whether an expression’s runtime type inherits or includes another type. For example: a = 1 a . is_a ?( Int32 ) #...

is_a? is_a? The pseudo-method is_a? determines whether an expression’s runtime type inherits or includes another type. For example: a = 1 a . is_a ?( Int32 ) #...

=== Conclusion This chapter has explained how to get started with language analysis using thetools that are available to you out of the box. You may never need more — itdepends ...

About this guide About this guide This is a formal specification of the Crystal language. You can read this document from top to bottom, but it’s advisable to jump through sect...

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