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So just to give you some help with doing 
the editor project, this video is just a 

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quick demo of what the editor should do 
when its done. 

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So here I'm in a solutions file, which 
you'll get after the project is over. 

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Remember, this is our solution. 
Your solution will have a similar 

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structure, maybe not the exact same 
structure, and should definitely have 

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this functionality. 
Let me run it. 

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And then I'll start it with main of make 
Editor, but we'll just start it with an 

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empty string, and of course, in an empty 
string, it has to be at position 0. 

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And it pops up a little editor here. 
Let me move it so you can see it a bit 

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better. 
And I can just type in this editor, hello 

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there. 
And if I press the back arrow key I move 

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to the left, if I press the right arrow 
key I move to the right, and wherever I 

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am the characters get inserted. 
It's just like the simple editor you'd 

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have on your phone maybe to send text 
messages. 

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And just to be clear about, what happens 
with the argument to main, let me restart 

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it now. 
I'll say main, make editor, dog, cat, 

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starting at position, 3. 
And this editor starts out with the 

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string, dog cat. 
And the cursor starts out at position 3. 

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Remember, we're using 0-based indexing, 
so to the left of the D is 0, 1, 2, 3. 

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And then we can edit from there. 
And of course, dog, cat, I don't know, 

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mouse. 
Do those go together? 

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Who knows. 
When we close this, the final result the 

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big bag produces is the final world's 
day. 

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So that's a quick little demo of what the 
editor is supposed to do. 

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We hope that this will answers most of 
your questions about what we're asking 

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you to design.