Javascript option handling

Question

What is a better/shorter way to write option handling in JavaScript. Instead of the following pattern?

    if(typeof p_options.default_imageset !== "undefined") {
        default_imageset = p_options.default_imageset;
    } else {
        default_imageset = 'mm';
    }

Thanks.

Blender · Accepted Answer · 2012-12-25 04:37:41Z

8

You can use something like this:

var default_imageset = p_options.default_imageset || 'mm';

If p_options.default_imageset is truthy (not 0, null, false, '', etc.), the operator short-circuits.

Although usually I do it the other way around:

var value = supplied_value || default_value;

answered Dec 25, 2012 at 4:37

Blender

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2 Comments

Justin Over a year ago

Perfect how do you handle the same case, but 0 being a valid option value. In that case, if you provided 0 it would use the fallback.

Blender Over a year ago

@Justin: You'll have to use something like var value = typeof supplied !== 'undefined' ? supplied : default;

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