Question

I have the following code and need to check if a value exists as an array key.

I can’t seem to generate the index of the key even though it does exist, any help would be great.

Code:

var run = { // store the actions to trigger

    block : function() {
        console.log('Blocking…');
    },

    warning : function() {
        console.log('Warning…');
    }

};

console.log( $.inArray( 'warning' , run ) );

As far as I can see, warning exists inside run{} and should return an index of 1.

Why isn’t the above doesn’t get found (index is returned as -1).

Thanks for reading.

Answer 1

run isn’t an array (it’s just a plain object) so it doesn’t have an index. Even though block comes before warning, objects are order-less, so you can’t say that run has an index of 1.

To check if an object has a particular key, simply check:

if ('warning' in run) {...}

Or:

if (run.warning) {...}