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instance method

Hash#member?

hash.member?(key) → true or false

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

Methods has_key?, key?, and member? are aliases for #include?.

Returns true if key is a key in self, otherwise false.

See also #include? #length #merge #keys also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1 · 3.0