deep-transform-object

Performs a deep transformation on complex nested objects and arrays

Install

npm i deep-transform-object

const deepTransform = require('deep-transform-object')

// Complex nested objects
const complexNestedObject = {
    transactions: [
        { 
            id: 1,
            amounts: [
                { value: 10 },
                { value: 20 },
            ]
        },
        { 
            id: 2,
            // amounts: undefined
        },
        { 
            id: 3,
            amounts: [
                { value: 30 },
                { value: 40 },
            ]
        }
    ]
}

// Converts all `values` keys to string
const initialValue = 0
const transformer = (val) => String(val))
const path = 'transactions.amounts.value'
const sum = deepTransform(complexNestedObject, transformer, path)
// sum = 100

API

deepTransform takes 4 arguments. 3 mandatory and 1 optional:

deepTransform (
    collection: object|array,
    transformer: (currentValue: any) => any, // MUST RETURN THE TRANSFORMED OBJECT
    path: string,
    context: any
): any

Arguments

• collection Object or Array to traverse.
• transformer Function to call with every value in obj-tree. See section below for transformer function signature.
• path Path to the inner property of collection to be transformed.
• context (optional) Bound to transformer as this.

Arguments for transformer function

The transformer function is called with these arguments:

(value: any) => any

• value Value of current path.
• MUST RETURN THE TRANSFORMED VALUE

Development

git clone https://github.com/eltonbor/deep-transform-object.git
cd deep-transform-object
npm install
npm test  # runs node index.test.js

Inspired on

https://github.com/kmalakoff/reduce-deep

License

MIT © 2022 Elton Tasca Borssoi