Redo verses Undo

@alokijon (665)
Malaysia
January 10, 2011 4:24pm CST
One of my friends asking me the different between redo and undo. Now, is there any different between the two? For me both are referring to an act to doing it again. Or is there any different between redo and undo? It is fun to get myself confused hehehe.
3 responses
• Philippines
10 Jan 11
Redo means to return the removed action while undo means return back to a previous state. The similarity is that both have the root word 'do'.
• Philippines
10 Jan 11
cowboyofhell is right, this is the best explanation of the difference between redo and undo. From the prefix "un" and "re". Both have different name and functionality. If you are working on something then you made a mistake and you want to change your mistake by writing again, then use undo. It will remove the mistake and you can rewrite again. If you use redo, it will redirect you back to your previous work before you made a mistake. Undo: Prev - Dog bark Present - Dog barks Undo - Dog bark - If you made a mistake by putting 's', when you press undo it will remove 's' from the present meaning, to undo or remove 's'. Redo: Prev - Dog bark Present - Dog barks Redo - Dog bark - If you made a mistake by putting 's'. when you press redo, it will redirect you to the previous work you create which is "Dog bark". Both have same output when you use but different in terms of behavior.
1 person likes this
@owlwings (38400)
• Cambridge, England
10 Jan 11
There is a big difference between the two! To redo something is to do it again (having done it at least once before). To undo something is to make it as it was before you did whatever it was. There are some things, of course, which cannot be undone, like a stuck zip or adding milk and sugar to coffee when the order was for a black, no sugar. Hope that makes it clear.
@_sketch_ (5711)
• United States
10 Jan 11
Re = again , Un = not. So redo means to do again; and undo means to not do (reverse something back to an original state.)