[removed] Getting all existing keys in a JSON array

Question

I have a JSON array like below:

var jsonArray = [{\"k1\":\"v1\"},{\"k2\":\"v2\"},{\"k3\":\"v3\"},{\"k4\":\"v4\"},{\"k5\":\"v5\"}]

I don\'t

Answer 1

Loop through the object properties, and select the first "real" one (which given your data schema should be the only real one).

var jsonArray = [{"k1":"v1"},{"k2":"v2"},{"k3":"v3"},{"k4":"v4"},{"k5":"v5"}]

for (var i = 0; i < jsonArray.length; i++) {
    for (var prop in jsonArray[i]) {
        if (jsonArray[i].hasOwnProperty(prop)) {
            var key = prop;
            break;
        }
    }
    alert(key);
}

See How to loop through items in a js object? for an explanation of why it's important to use hasOwnProperty here.