struct

Hash::View(K, V)

Inherits Iterable < Enumerable < Struct < Value < Object

A HashView is a read-only version of a Hash. This is useful to give access to a non-modifiable hash in a type-safe manner.

The functionality of HashView is limited by design, as it just delegates the non-writable methods to the enclosed hash.

arr = HashView.new({"a" => 1, "b" => 2})
arr.size        # => 2
arr["a"]        # => 1
arr.select "b"  # => {"b" => 2}
arr.select! "b" # does not compile
arr["c"] = 3    # does not compile

Constructors

new(hash : Hash(K, V) = {} of K => V)

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Instance methods

==(rhs : Hash(K, V)) : Bool

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==(rhs : self) : Bool

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[](*args, **options)

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[](*args, **options, &)

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[]?(*args, **options)

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[]?(*args, **options, &)

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compact(*args, **options)

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compact(*args, **options, &)

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dig(*args, **options)

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dig(*args, **options, &)

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dig?(*args, **options)

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dig?(*args, **options, &)

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each(*args, **options)

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each(*args, **options, &)

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each_key(*args, **options)

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each_key(*args, **options, &)

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each_value(*args, **options)

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each_value(*args, **options, &)

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empty?(*args, **options)

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empty?(*args, **options, &)

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fetch(*args, **options)

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fetch(*args, **options, &)

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first_key(*args, **options)

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first_key(*args, **options, &)

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first_key?(*args, **options)

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first_key?(*args, **options, &)

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first_value(*args, **options)

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first_value(*args, **options, &)

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first_value?(*args, **options)

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first_value?(*args, **options, &)

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has_key?(*args, **options)

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has_key?(*args, **options, &)

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has_value?(*args, **options)

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has_value?(*args, **options, &)

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inspect(io : IO) : Nil

Appends this struct's name and instance variables names and values to the given IO.

struct Point
  def initialize(@x : Int32, @y : Int32)
  end
end

p1 = Point.new 1, 2
p1.to_s    # "Point(@x=1, @y=2)"
p1.inspect # "Point(@x=1, @y=2)"

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invert(*args, **options)

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invert(*args, **options, &)

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key_for(*args, **options)

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key_for(*args, **options, &)

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key_for?(*args, **options)

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key_for?(*args, **options, &)