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String

A String object holds and manipulates an arbitrary sequence of bytes, typically representing characters.

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Integer

Represent whole numbers in Ruby


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Array

Arrays are ordered, integer-indexed collections of any object.

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Hash

A Hash is a dictionary-like collection of unique keys and their values.

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Symbol

Symbol objects represent names and some strings inside the Ruby interpreter.

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Kernel

The Kernel module is included by class Object, so its methods are available in every Ruby object.

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