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JavaScript (Node.js), 53 bytes f=(a,b=[],c=a.map(([a,...c])=>(b+=[a],c)))=>b&&b+f(c) Try it online!
Answer
#1: Initial revision
by
Hakerh400
·
2020-11-23T02:34:02Z (about 4 years ago)
# [JavaScript (Node.js)], 53 bytes
<!-- language-all: lang-javascript -->
f=(a,b=[],c=a.map(([a,...c])=>(b+=[a],c)))=>b&&b+f(c)
[Try it online!][TIO-khtxn9kw]
[JavaScript (Node.js)]: https://nodejs.org
[TIO-khtxn9kw]: https://tio.run/##dY3BCsIwEETvfoWnJqExP1AiiAoeBD14Cz1s0qSNpklpa9Gvr4sepTCHGebt7B0mGEzvu3ETU2Xn2UkKXEtVciNBtNBRqoALIUzJ5JbqXCrAjjFMOst07qhhc2FSHFKwIqSaOqrIw8dEODE@2hbQtGnylpSMFas/1uBjROoU3AJx8tijbo3tl1aOry5AhNGnuEAc3oB2vbuecWr/DKOffjgnl9400Fffw/kD "JavaScript (Node.js) – Try It Online"