Something like this should do it in JavaScript. I'm not entirely sure if this sort is okay, though. I can never remember which way it's ascendent and which descendent.
const pairDifference = list => list .sort() .filter(x => list.includes(x + 2)) .map(x => [ x, x + 2 ])
This really is Savage
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Something like this should do it in JavaScript. I'm not entirely sure if this sort is okay, though. I can never remember which way it's ascendent and which descendent.
This really is Savage