I'm not sure if languages are designed to build libraries or apps specifically. The languages I use are designed to communicate with a computer. It's the framew

I'm not sure if languages are designed to build libraries or apps specifically. The languages I use are designed to communicate with a computer. It's the frameworks that dictate how we package a set of instructions. So a "pure language" here is just a bs marketing term rather than any inherent feature in the language. As far as purity goes, a language like c does that just fine. That's as pure a language as it can get. This whole opinionated "can never allocate memory" is condescending to engineers. A powerful language should be safe by default (to take some of the pressure off the developers of having to be always careful) but have the knobs to let them take full control when needed. C# does this very well.