Question

92

How to check whether my key exists in array of object

rated 0 times [ 94] [ 2] / answers: 1 / hits: 77670 / 13 Years ago, tue, february 7, 2012, 12:00:00

var arr = [{

   key: key1, value: z

}, {

   key: key2, value: u

}, {

   ...

}];

How to check whether my key:key1 exists already or not. If it does not exist, i need to add the key in ma array.

if(arr.hasOwnProperty(key1)){

      arr.unshift({key:key1, value:z});

}

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raynamadilynl

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answered 13 Years ago janiajohnnad · Accepted Answer

Since you've got an Array filled with Objects, you need to do it like:

(ES3)

function lookup( name ) {

    for(var i = 0, len = arr.length; i < len; i++) {

        if( arr[ i ].key === name )

            return true;

    }

    return false;

}



if( !lookup( 'key1' ) ) {

    arr.push({

        key: 'key1',

        value: 'z'

    });

}