3 SIMPLE TRICKS FOR RECURSION OVER A TREE STRUCTURE in JavaScript / NodeJS

#node #javascript

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.

This code block is no longer available. The original code is shown below.


    
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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