Get a deep property of a javascript object. Accepts a property in the form 'foo.bar.deepProp.reallyDeepProp'

getDeepProperty.js

/**
   * Get the value of a property that is nested in several objects given a string of properties in the form
   *  'foo.bar.deepProp.reallyDeepProp' would return the value 'whew that was deep' from the object
   * { foo: {
   *     bar: {
   *       deepProp:{
    *        reallyDeepProp: 'whew that was deep'
    *      }
   *     }
   *  }
   *
   * @param obj
   * @param property
   * @returns {*}
   */
function getDeepProperty(obj, property){
  function isObject(value) { //Copied from Angular@1.4.9
    return value !== null && typeof value === 'object';
  }
  var properties = property.split('.');
  var tObj = obj;
  //todo: catch error or throw it?
  try{
    //Loop through all but the last property
    for (var i=0; i< properties.length-1;i++){
      if (isObject(tObj[properties[i]])){
        tObj = tObj[properties[i]];
      }else{
        throw new Error('\'' + properties[i] + '\' is not defined, or is not an object property of object ' + tObj);
      }
    }
    //return the final property
    return tObj[properties[properties.length-1]];
  }catch(e){
    console.log('Error: Trying to get property of a non-object value', e);
    return null;
  }
}

Wow. Been a long time. Looking at this again I'd probably use properties.split(".").reduce((curObj,prop) => curObj[prop], óbj) (summarized) instead of a for loop with -1