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instance method

Hash#include?

(::Hash::_Key key) -> bool

include?(key) → true or false

VALUE
rb_hash_has_key(VALUE hash, VALUE key)
{
    return RBOOL(hash_stlike_lookup(hash, key, NULL));
}

Returns whether key is a key in self:

Example

h = {foo: 0, bar: 1, baz: 2}
h.include?(:bar) # => true
h.include?(:BAR) # => false

See also #has_value? #initialize_copy #has_key? #inspect also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0