instance method

ObjectSpace::WeakMap#include?

map.key?(key) -> true or false

static VALUE
wmap_has_key(VALUE self, VALUE key)
{
    return RBOOL(!UNDEF_P(wmap_lookup(self, key)));
}

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

See also #each_value #inspect #each_pair #key? also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0