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>> SPEAKER: Suppose Scratches come
down with bit of a cold,

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and he keeps coughing.

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Let's begin to implement that program.

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When green fly clicked, let's have
Scratch say, not hello, but cough for

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one second. .

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And let's start there.

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Green flag, single cough .

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He's a bit more under the weather than
that, though, so let's have him cough

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a few times.

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>> But let's have him pause a little bit
to catch his breath in between each.

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So let's wait one second after that.

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And now let's go back to looks,
drag another say block.

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This time again saying,
cough for one second.

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And let's again grab wait one second.

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Now let's click the green flag.

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>> Two coughs.

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Some time passes, though, and he's
still not doing so well.

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And the next time this happens, he's
going to cough three times.

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Well, rather than dragging and dropping
and dragging and dropping the

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same puzzle pieces again and again,
Scratch actually let's me duplicate

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puzzle pieces by clicking with my right
mouse button or with Control

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clicked on my keyboard, duplicate, so
I can paste that right into place.

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>> So now, I have a sequence of three
coughs, and maybe more if I continue

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that pattern.

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Cough, cough, cough.

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Now, the fact that I was getting bored
dragging and dropping, or duplicating

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the same puzzle pieces should have been
a cue to me that I'm probably not

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implementing this program
with the best design.

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>> Any time you resort to dragging and
dropping the same puzzle pieces again

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and again, or copying and pasting your
own code, indeed, you could probably

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be implementing this program
more elegantly.

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In fact, haven't we seen a construct
before that would let us do something

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again, and again, and again?

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