How can I rescue an undefined property of an object in JavaScript

Questions

Okay, say you ve got two objects: greg and stacy. They re both people. Greg s object looks like this:

var greg = {
  name: "Greg",
  job: "doctor",
  age: 45
}

and Stacy s like this:

var stacy = {
  name: "Stacy",
  age: 42
}

When someone tries to access Stacy s job property, how can I have that return Unemployed without directly putting that as her job? I d like a solution that doesn t use prototypes, and I d really rather not use a function to access all the properties of an object.

Just for context: I m using this for an Ajax auto-loading system, similar to Rails s server-side one.

Answers

Use || to specify a default value when extracting the property.

var job = person.job || "Unemployed";

However, this has to be done in every place where you get the job. If you don t want to have to repeat it all over the place, you need to use a function or prototype.

Source

License : cc by-sa 3.0

http://stackoverflow.com/questions/25191594/how-can-i-rescue-an-undefined-property-of-an-object-in-javascript

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