Question

First of all, let me warn you that i am not a javascript guru.
I already found a few questions regarding this topic but almost all of them answer with the same solution.
I have a simple custom javascript object:

var errorMsg ={
      msg1 : "x",
      msg2 : "y",
      msg3 : "z",
      msg4 : "t"
}

and i want to get all the properties names from the object like [“msg1″,”msg2″,”msg3″,”msg4”].
Like i told almost solution point to the use of the for/in loop to iterate over all properties name. But my app will run in IE6 and above, and i research that IE does not support this loop or at least the IE6. So what can i do ?
The last question is , where can i find a good javascript reference ? I saw that the Object have a method that returns keys like Object.keys() , where can i find a good reference that gives me all the properties and method related with javascript built in objects ?

Answer 1

You could define a generic method for returning an array of keys from any object,
and use the function’s call method to operate on the errorMsg object:

var errorMsg={
    msg1:"x",
    msg2:"y",
    msg3:"z",
    msg4:"t"
}
function keyArray(){
    var A= [];
    for(var p in this){
        if(this.hasOwnProperty(p)) A.push(p);
    }
    return A;
}
keyArray.call(errorMsg)

/*  returned value: (Array)
msg1,msg2,msg3,msg4
*/