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frontsideair/comma-operator-push-pop.js

Created January 3, 2017 10:47
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Simple implementation of push/pop with comma operator, function scope
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comma-operator-push-pop.js
const pop = (arr, tmp) => (tmp = arr.slice(0), tmp.pop(), tmp)
const push = (arr, item, tmp) => (tmp = arr.slice(0), tmp.push(item), tmp)
// Can you see why and how this works? Does it really? Can you guess if it's pure or impure?
// Does it modify any of its arguments, or pollute global scope?
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