Glean... what you want from any data source.

glean.js

/**
 * glean - Access nested paths in an object whos structure we are uncertain of.
 * Unholy marriage of Facebook's existential function and lodash get()
 * https://facebook.github.io/react-native/blog/2017/03/13/idx-the-existential-function.html
 * https://lodash.com/docs#get
 *
 * @param  {Object} source            the source object we are operating on
 * @param  {Function} accessor        attepts to access the property desired
 * @param  {Any} defaultValue = null  value to return if the accessor throws
 * @return {Any}
 */
glean(source, accessor, defaultValue = null) {
  try {
    const val = accessor(source);
    if (typeof val === 'undefined') { return defaultValue; }
    return val;
  } catch(err) {
    return defaultValue;
  }
}

const src = {a: {b: 'c'}};

glean(src, _=>_.a.b);
// => "c"
glean(src, _=>_.a.b.c);
// => null
glean(src, _=>_.a.b.c, 'default');
// => "default"
glean(src, _=>_.a.b === true, false);
// => false
glean(src, _=>_.a.b === 'c', false);
// => true