Turn JavaScript Objects in Maps for Predictability

No more errors with undefined properties

Photo by NASA on Unsplash

The Problem With Objects

You’re deep into your code, and suddenly you get an error: “Cannot read property x of undefined.” Awww, man.

Most of the time, this means debugging — attacking my code with debugger here, console.log() there. Most of the time, I get it fixed fast. But there are those days that it takes me hours.

Example Problem

We have an object called car.

The car object has a set of key-value pairs. We get this information from our API. Normally, you’d get an events property inside the object that includes the property last_updated — stating the last time this information has been changed.