How to find a value in object of objects with an array of keys

Question

for example I have an object that that has objects and arrays in itself:

const object = 
{
    a: {
        b: [
            0: 'something',
            1: {
                c: 'the thing that I need',
            },
        ],
    },
};

and an array that has the keys as values:

const array =
[
   'a', 'b', '1', 'c',
];

How can I use this array to navigate in the object and give me the value? Maybe there is a way to do this with ramda ? or just in general to make it look human readable.

Answer 1

You can reduce the array defining the path through the object. You do have an error in the array. The path should be: [ 'a', 'b', '1', 'c' ], because the thing you need is inside the second element of the b array, not the first.

 const object = { a: { b: [ 'something', { c: 'the thing that I need' } ], }, }; const path = [ 'a', 'b', '1', 'c' ]; const result = path.reduce(( source, next ) => source[ next ], object ); console.log( result ); 

Answer 2

该功能在Ramda中称为path 。

Answer 3

Ian Hoffman-Hicks' superb crocks library has a function that does exactly that

import propPathOr from 'crocks/helpers/propPathOr'
const getC = propPathOr(null, ['a', 'b', '0', 'c'])
getC({ a: { b: [{ c: 'gotcha!' }] } }) === 'gotcha!' // true