Universal getter for plain JS objects.

Many times in JavaScript we have to reach deep into objects to access fields that could possibly not be there at all; for example let’s assume I have a JS object called options into which I’ve just read an entire JSON configuration file. Trying to access a field like options.application.cache.enable directly will potentially fail (e.g. when any of the intermediate levels is missing)… if (options.application.cache.enable) { // do stuff }

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