Google script Type error when try to move files to folder - file

Question

I'm trying to select multiple files depending on the mime type (JPG and Google Docs in this example) and move to specific folders for each type. So I tried the following:
function test() {
var srcfolderId = "abcdefghi";
var jpgFolderID=DriveApp.getFolderById(srcfolderId).createFolder("jpgfiles").getId();
var gdocFolderID=DriveApp.getFolderById(srcfolderId).createFolder("gdocfiles").getId();
var jpgfiles=DriveApp.getFolderById(srcfolderId).getFilesByType(MimeType.JPEG);
var gdocfiles=DriveApp.getFolderById(srcfolderId).getFilesByType(MimeType.GOOGLE_DOCS);
jpgfiles.moveTo(jpgFolderID);
gdocfiles.moveTo(gdocFolderID);
}
But this creates the error:
TypeError: jpgfiles.moveTo is not a function
What should I need to do to escape from this error? Should I use a different way to move multiple files to a specific folder?

Answer 1

Modification points:
The reason for your issue of TypeError: jpgfiles.moveTo is not a function is due to that the argument of moveTo is the folder object. In your script, the folder ID is used.
DriveApp.getFolderById(srcfolderId) can be declared as one variable.
getFilesByType returns FileIterator.
When these points are reflected in your script, it becomes as follows.
Modified script:
function test() {
var srcfolderId = "abcdefghi";
var folder = DriveApp.getFolderById(srcfolderId);
var jpgFolder = folder.createFolder("jpgfiles");
var gdocFolder = folder.createFolder("gdocfiles");
var jpgfiles = folder.getFilesByType(MimeType.JPEG);
while (jpgfiles.hasNext()) {
jpgfiles.next().moveTo(jpgFolder);
}
var gdocfiles = folder.getFilesByType(MimeType.GOOGLE_DOCS);
while (gdocfiles.hasNext()) {
gdocfiles.next().moveTo(gdocFolder);
}
}
References:
getFilesByType(mimeType)
moveTo(destination)

Answer 2

Try adding something like this:
while(jpgfiles.hasNext()) {
let file = jpgfiles.next();
file.mmoveTo()....