So why is JRuby slow in these examples? It turns out that the answer is complicated. What Is JRuby? I was very happy to discover the JRuby project, my favorite programming language running on whatâs probably the best virtual machine in the world. - Peter Lind JRuby is an alternative Ruby interpreter that runs on the Java Virtual Machine (JVM). MRI Ruby, also known as CRuby, is written in C and is
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