Possible bug in JavaScript editor

[sergei.sheinin]

I get a warning stating "The method join() is undefined for object []" for "join()" function in code below:

Code: Select all

function isThisABug(){
   
   var test = {element: []},
      str = '';
   
   test.element[0] = ['Apple', 'Orange', 'Banana'];
   
   str = test.element[0].join(',');
   
   
   
   application.output(str);
   
}

However the code runs as expected. This looks like a bug and I wasn't able to find a workaround yet (although I solved the problem by re-working the algorithm in the program).

Attaching a screenshot as well.

[sovanm]

Hi,

Adding JSDoc above your variable list will make servoy understand what kind of variable the objects contains.

Code: Select all

   /**@type {{element: Array<Array<String>>}}*/
      var test = {element: []},
            /** @type {String} */
            str,
            /**@type {String}*/
         str2;
      
      test.element[0] = ['Apple', 'Orange', 'Banana'];
      test.element[1] = ['Hello', 'world', 'Banana'];
      
      str = test.element[1].join(',');
      str2 = test.element[0].join(',');
      
      application.output(str);
      application.output(str2);

Here you would not get any warnings and also able to get the code completion for Array.

Output:

Code: Select all

Hello,world,Banana
Apple,Orange,Banana


Hope this will help you.

Thanks,

[sergei.sheinin]

Ic, thanks.

[Joas]

For more info, read this page on our wiki: Annotating JavaScript Using JSDoc.

[jcompagner]

in this case even this was already fixing it:

Code: Select all

     var tst = {element: [[]]},
     str = '';
     tst.element[0] = ['Apple', 'Orange', 'Banana'];
     str = tst.element[0].join(',');
     application.output(str);


so just init the element directly as an array of arrays..