struct

Crig::OneOrMany(T)

Inherits Enumerable < Struct < Value < Object

Constructors

from_json(input : String) : self

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from_json_any(value : JSON::Any) : self

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many(items : Enumerable(T)) : self

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merge(items : Enumerable(self)) : self

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new(pull : JSON::PullParser) : self

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new(first : T, rest : Array(T) = [] of T)

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one(item : T) : self

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Class methods

from_iter_optional(items : Enumerable(T)) : self | Nil

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Instance methods

each

Must yield this collection's elements to the block.

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empty?

Returns true if self does not contain any element.

([] of Int32).empty? # => true
([1]).empty?         # => false
[nil, false].empty?  # => false

#present? returns the inverse.

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first

Returns the first element in the collection. Raises Enumerable::EmptyError if the collection is empty.

([1, 2, 3]).first   # => 1
([] of Int32).first # raises Enumerable::EmptyError

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first_mut

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first_ref

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insert(index : Int, item : T) : Nil

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into_iter

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is_empty

ameba:disable Naming/PredicateName

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iter

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iter_mut

Crystal cannot yield Rust-style mutable references, so this iterator returns the same underlying objects for reference types while preserving visit order.

last

last_mut

last_ref

len

map_one_or_many

Transforms each item to a new type, returning a new OneOrMany. Unlike Enumerable#map (which returns an Array), this preserves the OneOrMany guarantee.

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push(item : T) : Nil

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rest

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to_a

Returns an Array with all the elements in the collection.