Ruby

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Symbol Id's


It is a common misconception that a symbol is a type of string. After all, isn’t the symbol, :hello pretty similar to the string, ‚hello‛? In fact, symbols are quite unlike strings.

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Ints and Symbols


Int and Symbol Together

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All Symbols


p( Symbol.all_symbols )

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Why Symbols


Some methods in the Ruby class library specify symbols as arguments. Naturally, if you need to call those methods, you are obliged to pass symbols to them.

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Unless


Using Unless

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Negation


Using Not Operator

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Universal Constant


This is how we work with Universal Constants in Ruby

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if unless Modifiers


You may recall the alternative syntax for while loops mentioned in Chapter 5. Instead of writing this< while tired do sleep end