Javascript tag ? syntax question

Question

I came across the following code snippet and am confused about what the not: is doing. Is it a tag? If so, are there any other uses for it?

var foo = {
   not: function(bool) { return !bool; }
}

Can you provide me with a possible use scenario for this kind of syntax?

parapura rajkumar · Accepted Answer · 2011-06-03 00:05:29Z

6

This is not a tag.

It is declaring an object with a property called "not" which is a function.

You can find more details at JSON and Javascript syntax

answered Jun 3, 2011 at 0:05

parapura rajkumar

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2 Comments

Codier Over a year ago

How dumb I am. still struggling to wind my head around for javascript syntax. Thanks a lot!!

Quentin Over a year ago

It isn't JSON. JSON is a data format based on a subset of JS that this doesn't conform to.

sepp2k · Accepted Answer · 2011-06-03 00:07:13Z

6

In Javascript the syntax { property: value } creates an object with the property property, whose value is value. So your code defined an object which has the property not, whose value is a function which returns the negation of its argument.

answered Jun 3, 2011 at 0:07

sepp2k

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