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Core classes and modules explore the essential classes and modules
Identical regexp can or cannot run in linear time depending on your ruby binary
Neither forward nor backward compatibility is guaranteed about the return value of this method. It also offers many scripting features to process plain text and serialized files, or manage system tasks It is simple, straightforward, and extensible. Class \struct provides a convenient way to create a simple class that can store and fetch values
The first argument, a string, is the name of th Ruby code can raise exceptions Most often, a raised exception is meant to alert the running program that an unusual (i.e., exceptional) situation has arisen, and may need to be handled. What’s here trigonometric functions ::cos
Returns the cosine of the given argument
Returns the sine of the given argument Returns the tangent of the given argument Returns the arc cosine of the given. Each of these methods takes optional argument format, which has zero or more embedded format specifications (see below).
'ruby'} person # => {name Ruby} you can use a hash to give names to method arguments Def some_method (hash) p hash end some_method ({foo When the last argument in a method call is a hash, the curly braces may be omitted:
Ruby’s grammar differentiates between statements and expressions
All expressions are statements (an expression is a type of statement), but not all statements are expressions.
