Given the path of property key, how to retrieve it? [duplicate]

Question

Consider I've an object myObj And I've a string representing the path to some property inside it: foo.bar

What is the best way to get it from my object?

If I knew the string ahead I would do myObj.foo && myObj.foo.bar to get it safely

A simple solution would be to split the string 'foo.bar'.split('.') and than loop over it.

But i'm sure there is a better way

It's a duplicate of other question. they provided a great solution:

given a path and an obj get the property value this way

path.split('.').reduce((o, i) => o[i], obj)

StriplingWarrior · Accepted Answer · 2017-06-14 15:35:29Z

A simple solution would be to split the string 'foo.bar'.split('.') and than loop over it.

Yep, that sounds like the best way. You can create a helper method that does exactly this, but there's nothing built in to the language or standard libraries to make things simpler than this.

function getFromPath(obj, path) { var current = obj; for(let piece of path.split('.')) { current = current[piece]; } return current; }

Usage:

getFromPath({foo: {bar: "hello"}}, "foo.bar"); // "hello"

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