Hash#include?

(K arg0) -> bool

hash.include?(key) → true or false

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

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

See also #has_value? #initialize_copy #has_key? #inspect also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0