Build a map with map = map + inside a loop and you’re copying the whole map on every pass; reach for << instead and you’re mutating something another part of the code may be reading. Picking the right Groovy add to map technique is a real decision, and this guide compares all 10 of them with tested examples on Groovy 5.0.6. “A map without entries is like a kitchen without ingredients. Knowing how to fill it efficiently ... Read More