Hi,

I noticed this is a file ScriptsFull.menu.htm:

for (var d in dirList)
{
var files = moi.filesystem.getFiles(dirList[d], '*.js' );
for ( var i = 0; i < files.length; ++i )
{
// some more stuff was here
}
}


The files are accessed using a for loop and an index variable.

Is this because the file list does not support the form as used for the directory list - for (var d in dirlist)?

Thanks.

Frederick

Hi Frederick,

re:
> Is this because the file list does not support the form as used for the
> directory list - for (var d in dirlist)?

Yes, here the dirlist variable is a native JavaScript Array that was created by the JavaScript runtime.

The files variable is a MoiList object created by Moi,

Until recently in v5 objects that were created by Moi did not support the for ( propname in object ) syntax.

Since v5 Mar-29-2023, the for ( propname in object ) syntax is now supported on objects created by MoI but it doesn't have the special behavior for JavaScript arrays.

It's generally considered a best practice to use a regular for () loop with an index variable to loop through the contents of an array and not for ... in .

Some info here:
https://stackoverflow.com/questions/5263847/javascript-loops-for-in-vs-for
https://www.geeksforgeeks.org/javascript/why-using-for-in-for-array-iteration-a-bad-idea-in-javascript/

- Michael

Hi Michael,

Interesting.

So it doesn't work anything like the 'for in" I use in Delphi. There the programmer gets to/has to code the class enumerator and thus "for in" can do exactly what he wants it to.

Over the years I am often bemused at some of the things that Java and JavaScript do.

Thanks for the references as well.

Frederick