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I like the "Composing Software" post series by Eric Elliott. It presents some functional programming concepts very well explained through javascript language. The name "software composition" implies in how to combine parts of testable software to form a reliable whole software. The series has lead to a book as told in the post below, but the posts are still available for free. Composing Software Series and Book
Express is a more complete application framework. Koa concentrates on core middleware functionality. The core Koa module is only about 2K lines of code. Express comes with a complete suite of middleware features built in. Koa does have options for these features, but they are separate modules. You only have to include the modules you need. Koa was designed explicitly to take advantage of the async/await keywords. You write more readable async code with Koa.
Both are a key/value store, but there are few differences between Hashtable an HashMap. Hashtable does not allow null keys or null values. HashMap allows one null key and any number of null values. Hashtable is thread safe (synchronized), whereas HashMap is not. This makes HashMap better for non-threaded use. Unsynchronized Objects perform better than synchronized ones.
Graal is a new just-in-time compiler for the Java Virtual Machine focused on peak performance and multi-language support. Graal offers performance advantages not only to Java code, but also to scripting languages such as JavaScript, Ruby, Python, and R. Additionally, it enables the execution of native code on the JVM via an LLVM-based front end. Languages are executed by Graal via the Truffle framework, which comes with seamless interoperability and polyglot debugging and profiling functionality.
