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Can anyone help me understand when to use :NEW and :OLD in PLSQL blocks, I'm finding it very difficult to understand their usage. Home - ThumperTalk Home - ThumperTalk New does not guarantee heap allocation and simply avoiding new does not guarantee stack allocation. New is always used to allocate dynamic memory, which then has to be freed. By doing the first option, that memory will be automagically freed when scope is lost. Home - ThumperTalk The new keyword in JavaScript can be quite confusing when it is first encountered, as people tend to think that JavaScript is not an object-oriented programming language. What is it? What problems. Stack Overflow | The World’s Largest Online Community for Developers Update April 1st, 2026 The Beta site is being retired. Update February 27th, 2026 Another post discussing the changes with the Chief Product and Technology Officer is here. Update February 26th. Home - ThumperTalk Add new keys to a nested dictionary If a key has to be added to a dictionary that is nested inside a dictionary, dict.setdefault (or collections.defaultdict) is really useful.