MIP Troubleshooting problems with variants and iteration loops.

Why is my transform() function skipping the children variations? For example after the parent GROUP[0] , GROUP[3] is being processed instead of GROUP[1] and GROUP[2]. What's wrong with my tranform() function below?

function transform() {
    LOGGER . log("   ");
    LOGGER . log("    >>>> PRODUCT <<<<");
    LOGGER . log("Group ID = " + getGroupColumnKey() + ", Group size = " + GROUP . length);

    for(i=0;
    i < GROUP . length;
    i++) {
        LOGGER . log("    ");
        LOGGER . log("transformimg Group [" + i + "]");


        PRODUCT_INRECORD = GROUP[i];
        if (i == 0) {
            LOGGER . log("--> transform parent: Group [" + i + "]");
            transformParent();
        }
        LOGGER . log(" --> transforming child: Group [" + i + "]");
        transformChild();
    }
}

In the Product Transform Function(in the mapping-base.js)
The  process log shows that the iteration variable "i" is being incremented randomly, more than +1, which means its being changed by functions out of scope.

In Java script its always a good habit to declare Variables as Local variables by declaring as -> var i = 0;

Var keyword declares the variable as a local variable. local to the fucntion its declared in, so that no external functions can change the variable.

The value of i is being incremented randomly in the transform() function, so the items are being processed ar 0, 3,4 etc instead of 0,1,2,  etc....  So I removed For loop and replaced it with a while, so that i can declare "i" as a non local variable(Local variables hold their values only in the current scope, This prevents any external functions to increment/change the vars.).

So the final function would be

function transform() {
      LOGGER.log("   ");
     LOGGER.log("    >>>> PRODUCT <<<<");
     LOGGER.log("Group ID = " + getGroupColumnKey() + ", Group size = " + GROUP.length);
     
     /*for(i=0; i < GROUP.length; i++)
      {
      LOGGER.log("    ");
      //LOGGER.log("transformimg Group [" + i + "]");
     
          
        PRODUCT_INRECORD = GROUP[i];
          if( i == 0)
          {
               //LOGGER.log("--> transform parent: Group [" + i + "]");
               transformParent();
                }else{
                  LOGGER.log(" --> transforming child: Group [" + i + "]");
                       transformChild();
                }
        
     }*/
       
 for(var i=0; i < GROUP.length; i++)
      {
      LOGGER.log("    ");
      //LOGGER.log("transformimg Group [" + i + "]");
     
          
        PRODUCT_INRECORD = GROUP[i];
          if( i == 0)
          {
               //LOGGER.log("--> transform parent: Group [" + i + "]");
               transformParent();
                }else{
                  LOGGER.log(" --> transforming child: Group [" + i + "]");
                       transformChild();
                }
        
     }
       
    
}

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