Using Lodash `_.get` to access object key using bracket notation

You can pass an array to define the evaluation path.

This is one pretty clean solution to your problem:

const test = {foo: {bar: 23}}
const key = 'foo'

console.log(_.get(test, [key, 'bar'])) // 23

<script src='https://cdn.jsdelivr.net/lodash/4.16.6/lodash.min.js'></script>

You need to put the value of key into your path string:

_.get(test, key + '.bar');

In ES2015 you can use a template literal (interpolated string):

_.get(test, `${key}.bar`);

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