Nodejs (not web):
const rgb = (...args) => Buffer.from(args).toString('hex') // .toUpperCase() // if you are wasteful xD
Not necessarily actually efficient, but definitely hilarious.
General JS:
const rgb = (...args) => args.reduce((a, x, i) => a + x * 0x100 ** (2 /*or args.length*/ - i), 0) .toString(16).toUpperCase().padStart(6, '0')
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Nodejs (not web):
Not necessarily actually efficient, but definitely hilarious.
General JS: