abstract struct Value

Overview

Value is the base type of the primitive types (Nil, Bool, Char, Number), Symbol, Pointer, Tuple, StaticArray and all structs.

A Value is passed by value: when you pass it to methods, return it from methods or assign it to variables, a copy of the value is actually passed. This is not important for nil, bools, integers, floats, symbols, pointers and tuples, because they are immutable, but with a mutable Struct or with a StaticArray you have to be careful. Read their documentation to learn more about this.

Direct Known Subclasses

Defined in:

value.cr

Instance Method Summary

Instance methods inherited from class Object

!=(other) !=, !~(other) !~, ==(other) ==, ===(other)
===(other : YAML::Any)
===(other : JSON::Any) ===, =~(other) =~, class class, crystal_type_id crystal_type_id, dup dup, hash hash, inspect(io : IO)
inspect inspect, itself itself, not_nil! not_nil!, tap(&block) tap, to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s
to_s(io : IO) to_s, to_yaml
to_yaml(io : IO) to_yaml, try(&block) try

Class methods inherited from class Object

==(other : Class) ==, ===(other) ===, cast(other) : self cast, clone clone, dup dup, from_json(string_or_io) : self
from_json(string_or_io, root : String) : self from_json, from_yaml(string : String) : self from_yaml, hash hash, inspect(io) inspect, name : String name, nilable? nilable?, to_s(io) to_s, |(other : U.class) forall U |

Instance Method Detail

def ==(other) #

Returns false.


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def dup #

Returns a shallow copy of this object.

Because Value is a value type, this method returns self, which already involves a shallow copy of this object because value types are passed by value.


[View source]