1
00:00:00,000 --> 00:00:00,170


2
00:00:00,170 --> 00:00:00,265
[VIDEO PLAYBACK]

3
00:00:00,265 --> 00:00:01,350
DAVID MALAN: What these
running times are,

4
00:00:01,350 --> 00:00:04,740
and we'll continue to revisit this issue
as we look at more algorithms and soon,

5
00:00:04,740 --> 00:00:05,910
data structures, still.

6
00:00:05,910 --> 00:00:06,493
[END PLAYBACK]

7
00:00:06,493 --> 00:00:09,130
DOUG LLOYD: The chapter title
of this segment in the video

8
00:00:09,130 --> 00:00:12,149
is very, very honest.

9
00:00:12,149 --> 00:00:14,190
DAVID MALAN: It's based
on the Maury Povich meme.

10
00:00:14,190 --> 00:00:19,216


11
00:00:19,216 --> 00:00:20,470
DOUG LLOYD: Yeah, strings--

12
00:00:20,470 --> 00:00:22,595
DAVID MALAN: Dated, but never truer.

13
00:00:22,595 --> 00:00:24,150
DOUG LLOYD: Is he still doing TV?

14
00:00:24,150 --> 00:00:27,744
Anyway, strings are a lie, and now
we finally tell the truth about them.

15
00:00:27,744 --> 00:00:29,910
DAVID MALAN: And we talked
about that some weeks ago

16
00:00:29,910 --> 00:00:32,868
when we deliberately introduced, via
the CS50 library, the typedef that

17
00:00:32,868 --> 00:00:36,500
is a string type, which doesn't
really exist because, of course,

18
00:00:36,500 --> 00:00:38,642
it's just the charstar
underneath the hood.

19
00:00:38,642 --> 00:00:40,350
But this is, I think,
interesting, right,

20
00:00:40,350 --> 00:00:42,266
because we're only a few
weeks into the class,

21
00:00:42,266 --> 00:00:44,070
but we're enough weeks
into the class where

22
00:00:44,070 --> 00:00:46,445
it's like time to start taking
off these training wheels.

23
00:00:46,445 --> 00:00:48,987
Because I do think we do
students a disservice ultimately

24
00:00:48,987 --> 00:00:50,820
if we didn't take these
training wheels off,

25
00:00:50,820 --> 00:00:53,910
and we sort of allowed them to think
through the duration of our use of C

26
00:00:53,910 --> 00:00:55,710
that, like, strings are in the language.

27
00:00:55,710 --> 00:00:56,460
DOUG LLOYD: Right.

28
00:00:56,460 --> 00:00:57,870
If they were to go out
later on and program

29
00:00:57,870 --> 00:01:00,840
in C without including the CS50
library, they would be possibly stuck.

30
00:01:00,840 --> 00:01:04,391
DAVID MALAN: No, you don't want
to hamper students in that way.

31
00:01:04,391 --> 00:01:06,265
And I think now it
affords us an opportunity,

32
00:01:06,265 --> 00:01:09,880
too, to remove those training wheels
not just for the sake of removing them

33
00:01:09,880 --> 00:01:11,840
but to actually now dive in deeper.

34
00:01:11,840 --> 00:01:12,690
Let's zoom in.

35
00:01:12,690 --> 00:01:15,540
Let's enhance it, like what is
going on underneath the hood,

36
00:01:15,540 --> 00:01:18,360
and use it as a genuinely
interesting, stimulating, if not

37
00:01:18,360 --> 00:01:22,835
challenging, opportunity to discuss
the underlying implementation details.

38
00:01:22,835 --> 00:01:24,821