0:00:00.320,0:00:03.740
One thing that computers are really good[br]at is repeating commands.

0:00:03.740,0:00:08.170
As a person, you'd get really bored if you[br]had to do the same thing lots of times in a row.

0:00:08.170,0:00:08.809


0:00:08.809,0:00:12.849
But a computer can do the same thing[br]millions or even billions of times,

0:00:12.849,0:00:15.000
and not get bored and be able to carry[br]that out really well.

0:00:15.500,0:00:17.430
So for example if I wanted to wish

0:00:17.430,0:00:20.960
everyone on Facebook a happy birthday by[br]sending them an email,

0:00:20.960,0:00:24.850
it might take me more than a century to[br]actually write out all of those emails to everyone.

0:00:24.850,0:00:25.269


0:00:25.269,0:00:28.760
But with just a few lines of code, I can have[br]a system

0:00:28.760,0:00:32.229
send an email to everyone on Facebook[br]wishing them a happy birthday.

0:00:32.229,0:00:34.000
So that's what loops are, and why they're[br]valuable,

0:00:34.500,0:00:37.180
and something that computers can do very well.

0:00:37.180,0:00:40.550
In this example your goal is going to be[br]to move the bird

0:00:40.550,0:00:44.940
to get the pig. Now we're gonna be able to use the "repeat" block

0:00:44.940,0:00:49.210
in order to be able to do this very[br]easily. You can either do this by

0:00:49.210,0:00:52.219
giving the computer a "move forward"[br]command

0:00:52.219,0:00:57.079
five times in order to advance the bird[br]one step each time to the pig.

0:00:57.079,0:01:00.590
Or you can just tell the computer to[br]"move forward" once,

0:01:00.590,0:01:04.150
and then tell it to "repeat" that 5[br]times, and it will do the same thing.

0:01:04.150,0:01:08.280
So in order to do this you drag your[br]"move forward" command,

0:01:08.280,0:01:11.729
and then you put it inside the[br]"repeat" block.

0:01:11.729,0:01:16.200
And you can click on it and tell it how[br]many times you want to repeat the block

0:01:16.200,0:01:19.970
to tell it how many steps you want it to[br]take forward. Now one more thing is

0:01:19.970,0:01:23.540
you can put as many commands as you[br]want inside the "repeat" block.

0:01:23.540,0:01:26.909
So in this example you're telling it to[br]move forward and turn left,

0:01:26.909,0:01:30.970
which it will do five times. Alright good[br]job and have fun :-)

0:01:30.970,0:01:31.220