Wireworld is cool: http://bit.ly/ctNose it's almost enough to drive a computer scientist into hardware.
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I made some changes to a node express project that I haven't touched in almost five years. I was pleasantly surprised that I only needed to update one dependency to get it working again!
(It was sqlite3, which is a native dependency using node-gyp.)
One advantage I've come to appreciate about Dash/Zeal docsets: it's really nice having focused search.
The text search is constrained to the languages I care about enough to download the docset, substantially increasing the relevance. In Google I'd need to specify the language.
I've heard of 'blub languages', where you don't realise that other languages have better abstractions until you've experienced them.
I think the same thing happens with individual features. I've seen several C++ folks miss variadic generics in Rust, but I've not written enough C++ to feel it.