End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Thread#key?
thr.key?(sym) → true or false
thread.c
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static VALUE
rb_thread_key_p(VALUE self, VALUE key)
{
VALUE val;
ID id = rb_check_id(&key);
struct rb_id_table *local_storage = rb_thread_ptr(self)->ec->local_storage;
if (!id || local_storage == NULL) {
return Qfalse;
}
return RBOOL(rb_id_table_lookup(local_storage, id, &val));
}
Returns true if the given string (or symbol) exists as a fiber-local variable.
Example
me = Thread.current me[:oliver] = "a" me.key?(:oliver) #=> true me.key?(:stanley) #=> false