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3 SIMPLE TRICKS FOR RECURSION OVER A TREE STRUCTURE in JavaScript / NodeJS
JavaScript Joel - Aug 25 '20 - 
- Dev Community
There are a few simple tricks I use to help simplify the process of creating a recursive function.
Recursion doesn't have to be difficult. These tricks, not only help you in writing and reasoning about a recursive function, but will also help reduce the complexity of that function.
const rxIsoDate = /\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d.\d+([+-][0-2]\d:[0-5]\d|Z)/
const isIsoDate = value => typeof value === 'string' && rxIsoDate.test(value)
const raw = {
a: 1,
date: '2020-07-17T01:32:26.206Z',
second: {
b: 2,
createdAt: '2020-07-17T01:32:26.206Z',
third: {
c: 3,
updatedAt: '2020-07-17T01:32:26.206Z'
}
}
}
const toJsDate = obj => {
if (isIsoDate(obj)) return new Date(obj)
if (typeof obj !== 'object') return obj
const nextObj = {}
for (const [prop, value] of Object.entries(obj)) {
nextObj[prop] = toJsDate(value)
}
return nextObj
}
toJsDate(raw)
As a BONUS, check out the Runkit here which also includes an example replacing the for loop with reduce https://runkit.com/joelnet/5f1344792ad936001ad53c94
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