Another Formula to JavaScript conversion

I have this code from everything I found on the internet:

var E = this.getField( "Text16").value; // the value of field E is line 7;

var F = this.getField( "Text17").value; // the value of field F is line 8;

var G = this.getField( "Text19").value; // the value of field G is line 10;

= MIN(E,F,G) ;// else value is minimum of line 7, 8 or 10;

Can anyone help me figure out why this is not returning a value?  Please note that all of these fields are calculated values.  Not sure if that matters.