var array1 = [
        {
            test1: 'test1',
            test2: 'test2'

        }, {
            test3: 'test3',
            test4:  'shmest4'
        }
    ]   



for (var x of array1) {
    if(x.hasOwnProperty('test3  ')) {
        console.log(x);
    }
};

for(var i in array1) {
    console.log(i);
}

console.log(3);