How to match String patterns of a key to get values of an array using JavaScript?

Question

I have following code snippet. I need to add this to a loop. What is the best way that I can follow.

A js object named Data is passed to the following JavaScript method and I need to check whether certain key are assigned the value "". Currently I'm using set of 'if' statement as below but I would like to acheive this using a loop.

privateMethods.generatePasswordDataPayload = function (Data) {
        if (Data["passwordLength"] == "") {
            Data["passwordLength"] = null;
        }
        if (Data["passwordComplexCharactors"] == "") {
            Data["passwordComplexCharactors"] = null;
        }
        if (Data["passwordExpTime"] == "") {
            Data["passwordExpTime"] = null;
        }
        if (Data["passwordHistory"] == "") {
            Data["passwordHistory"] = null;
        }
        if (Data["passwordAttempts"] == "") {
            Data["passwordAttempts"] = null;
        }
 }

Can I use any regex patterns and do something similar as below (pseudo code)

var i = 0;
while (Data.length >= i){
  if ((Data["password(regex pattern check)") == ""){
   (Data["password(regex pattern check)") == null;
  }
 i++;
}

Please note that I'm using JavaScript here.

Answer 1

If you want to list each property and set a value you can do something like this

for(objectName in Data) { 
     if(Data[objectName]=="") {
          Data[objectName] == null;
    }
}

Answer 2

String.prototype.indexOf will return the index of the first occurence of the string passed as parameter. So to get all the keys that start with "password" , you have to check if indexOf("password") return 0 or not (if it returned 0 then the key start with password , otherwise it doesn't).

privateMethods.generatePasswordDataPayload = function (Data) {
    for(var key in Data) { // for each key in Data
        if(key.indexOf("password") == 0) { // if the key starts with "password"
            Data[key] = null; // set the value to null
        }
    }
 }