undefsafe

Simple function for retrieving deep object properties without getting "Cannot read property 'X' of undefined"

Can also be used to safely set deep values.

Usage

```js var object = { a: { b: { c: 1, d: [1,2,3], e: 'remy' } } };

console.log(undefsafe(object, 'a.b.e')); // "remy" console.log(undefsafe(object, 'a.b.not.found')); // undefined ```

Demo: https://jsbin.com/eroqame/3/edit?js,console

Setting

```js var object = { a: { b: [1,2,3] } };

// modified object var res = undefsafe(object, 'a.b.0', 10);

console.log(object); // { a: { b: [10, 2, 3] } } console.log(res); // 1 - previous value ```

Star rules in paths

As of 1.2.0, undefsafe supports a * in the path if you want to search all of the properties (or array elements) for a particular element.

The function will only return a single result, either the 3rd argument validation value, or the first positive match. For example, the following github data:

```js const githubData = { commits: [{ modified: [ "one", "two" ] }, / ... / ] };

// first modified file found in the first commit console.log(undefsafe(githubData, 'commits.*.modified.0'));

// returns two or undefined if not found console.log(undefsafe(githubData, 'commits..modified.', 'two')); ```