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instance method

ObjectSpace::WeakMap#key?

key?(p1)

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

Returns true if key is registered

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