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134

Can I have a JavaScript object key without a value

rated 0 times [ 136] [ 2] / answers: 1 / hits: 23699 / 8 Years ago, wed, march 2, 2016, 12:00:00

I am wanting to store TaskPaper-like tasks in a JavaScript object. Suppose I have a task like

- Post to StackOverflow @priority(2) @due(2016-05-03) @flagged

This would turn into

{name:Post to StackOverflow, priority: 2, due:2016-05-03, flagged:value}

Flagged doesn't need a value and all I can think of is to use true or null

I would like to later filter tasks using if key in object and having true/false values wouldn't work with my workflow.

What would the SO community recommend as best practices.

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andrewb

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answered 8 Years ago soniap · Accepted Answer

If you do something like if (myobj.flagged), then if your value of flagged is true, the test passes. If the flagged property doesn't exist, then you get undefined which is falsy. So it works with flagged:true, flagged:false and even no flagged property. So use true, and omit the property altogether when it's not supposed to be there (so for...in would work in that case).