{|x| x _ x} Developer T-Shirt
{|x| x * x} is a Ruby block: the |x| names the parameter, and the body squares it. Hand it to a method like map and it runs once per element — [1,2,3].map { |x| x * x } gives [1,4,9]. The anonymous function Ruby threads through nearly everything it does, written inline at the point you need it.
Size guide
Technical details
The fabric is slightly sheer and may appear see-through, particularly in lighter colours or bright lighting.
Printed on demand — each piece is made to order.
Care
Shipping and returns
Shipping costs vary by region, so it's worth giving the delivery total at checkout a quick look before confirming your order. Some variants may show limited availability in certain locations—if fulfilment isn't available in your region, our suppliers will try to ship globally from the nearest facility that can produce that specific item. When this happens, delivery costs may be higher than expected due to the increased distance.
We're constantly reviewing suppliers and expanding fulfilment options, and new routes may open over time.