On Sat, Jun 25, 2011 at 9:26 PM, Matthew Bramer <[email protected]> wrote:
> I think that subject title is syntactically correct. Feel free to correct
> me if I'm mistaken.
> Here's some sample code:
> console.log( somePlugin.Query({
> listName: "Bid Key",
> config: {
> 1: {
> staticName: "ModuleNotes",
> value: "Some Comments"
> },
> 2: {
> staticName: "ID",
> value: 14,
> LookupId: true
> }
> }
> }
> })
> );
> What I'm trying to do is figure out how many things are stuffed inside of
> config. In this example it would be 2, but there could be 20. Based on the
> number of things stuffed into config, I need to run different code.
If you are in an environment where you can guarantee ECMAScript 5 (eg.
within Node.js), you can do:
Object.keys( opt.config ).length
However, you are likely executing within a browser. In which case,
you can't assume you have ES5 and should iterate through the
properties, finding just those that explicitly belong to this object:
var num = 0;
for ( prop in opt.config ) {
if ( opt.config.hasOwnProperty( prop ) ) num++;
}
console.log( num );
Of course, a better solution may be to shim in the Object.keys method:
if ( Object.keys === undefined ) {
Object.keys = function( obj ) {
var keys = [];
for ( prop in obj ) {
if ( obj.hasOwnProperty( prop ) ) keys.push( prop );
}
return keys;
}
}
and use it as in the ES5 solution.
_jason
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