Bytes module versus String module.
"Douglas Lewit [email protected] [ocaml_beginners]" <[email protected]> Tue, 7 Feb 2017 16:35:15 -0600
| Newsgroups | gmane.comp.lang.ocaml.beginners |
|---|---|
| Message-ID | <CAM0XMJQEOh_XnTSQJRG4xcFpHWObQuC2SD9+tdg-wbNUuhBq+g@mail.gmail.com> |
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Hi everyone,
I wrote the following functions.
*(* The function removeSpacesFromString' relies on the function
removeSpacesFromString. removeSpacesFromString' takes a string *
* such as "How are you doing" and parses it into a list of separate
words. In this case for example, removeSpacesFromString' *
* will return ["How"; "are"; "you"; "doing"]. *)*
*let rec removeSpacesFromString s w l = match Bytes.length s with *
* |0 -> List.rev begin [w] ::
l end*
* |_ -> match Bytes.make 1 (
Bytes.get s 0 ) with *
* |" " ->
removeSpacesFromString ( Bytes.sub s 1 ( Bytes.length s - 1 ) ) "" **([w]
:: l)*
* |_ ->
removeSpacesFromString ( Bytes.sub s 1 ( Bytes.length s - 1 ) ) *
* begin w ^ (
Bytes.make 1 ( Bytes.get s 0 ) ) end l ;;*
*let removeSpacesFromString' s = List.flatten begin removeSpacesFromString
s "" [] end ;;*
The functions work exactly as I want them to, which is great! But just for
the sake of experimentation I tried to substitute the "String" module for
the "Bytes" module into the first function above. Well guess what?
Nothing really changed! I still get the exact same results as before,
which leads to an interesting question. How is the Bytes module different
from the String module? I sort of get the impression from the online
documentation that the Bytes module is the "new and improved" version of
the String module, but if that's the case then why doesn't INRIA just
delete the String module from OCaml's Standard Library? Are the two
libraries pretty much the same? How is the Bytes library better than the
String library? What would happen if INRIA just decided to remove the
String library from the next major version of OCaml?
One quick question here before I send my email. How much does OCaml depend
on C? I know that Python and Ruby are essentially very large "C
applications" in the sense that the interpreters for those languages are
coded in the C language. ( Or at least that's what I have read online. )
What about OCaml. How is OCaml's compiler implemented? Is the OCaml
compiler written in C? Or written in something else?
I appreciate your feedback and thanks!
Best,
Douglas Lewit
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<p><div dir=3D"ltr"><font size=3D"4">Hi everyone,</font><div><font si=
ze=3D"4"><br></font></div><div><font size=3D"4">I wrote the following funct=
ions.</font></div><div><font size=3D"4"><br></font></div><div><font size=3D=
"4" color=3D"#cc0000"><b><br></b></font></div><div><font size=3D"4"><div><b=
><font color=3D"#20124d">(* The function removeSpacesFromString' relies=
on the function removeSpacesFromString. =C2=A0removeSpacesFromString' =
takes a string=C2=A0</font></b></div><div><b><font color=3D"#20124d">=C2=A0=
=C2=A0such as "How are you doing" and parses it into a list of s=
eparate words.=C2=A0 In this case for example, removeSpacesFromString'=
=C2=A0</font></b></div><div><b><font color=3D"#20124d">=C2=A0 =C2=A0will re=
turn ["How"; "are"; "you"; "doing"]=
. *)</font></b></div><div><b><font color=3D"#20124d"><br></font></b></div><=
div><b><font color=3D"#20124d"><br></font></b></div><div><b><font color=3D"=
#20124d">let rec removeSpacesFromString s w l =3D match Bytes.length s with=
=C2=A0</font></b></div><div><b><font color=3D"#20124d">=C2=A0 =C2=A0 =C2=A0=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |0 ->=
List.rev begin [w] :: l end</font></b></div><div><b><font color=3D"#20124d=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |_ -> match Bytes.make 1 ( Bytes.get s 0 ) with=C2=A0</fon=
t></b></div><div><b><font color=3D"#20124d">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 |" " -> removeSpacesFromString ( Bytes.sub s 1 ( Bytes.len=
gth s - 1 ) ) =C2=A0"" =C2=A0</font></b><b><font color=3D"#20124d=
">([w] :: l)</font></b></div><div><b><font color=3D"#20124d">=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |_ =C2=A0 -> removeSpacesFromString ( Bytes.sub s 1=
( Bytes.length s - 1 ) )=C2=A0</font></b></div><div><b><font color=3D"#201=
24d">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0begin w ^ ( Bytes.make 1 ( Bytes.get s 0 ) ) =C2=A0end l ;;</font></b=
></div><div><b><font color=3D"#20124d"><br></font></b></div><div><b><font c=
olor=3D"#20124d"><br></font></b></div><div><b><font color=3D"#20124d">let r=
emoveSpacesFromString' s =3D List.flatten begin removeSpacesFromString =
s "" [] end ;;</font></b></div><div><b><font color=3D"#cc0000"><b=
r></font></b></div><div><br></div><div>The functions work exactly as I want=
them to, which is great!=C2=A0 But just for the sake of experimentation I =
tried to substitute the "String" module for the "Bytes"=
module into the first function above.=C2=A0 Well guess what?=C2=A0 Nothing=
really changed!=C2=A0 I still get the exact same results as before, which =
leads to an interesting question.=C2=A0 How is the Bytes module different f=
rom the String module?=C2=A0 I sort of get the impression from the online d=
ocumentation that the Bytes module is the "new and improved" vers=
ion of the String module, but if that's the case then why doesn't I=
NRIA just delete the String module from OCaml's Standard Library?=C2=A0=
Are the two libraries pretty much the same?=C2=A0 How is the Bytes library=
better than the String library?=C2=A0 What would happen if INRIA just deci=
ded to remove the String library from the next major version of OCaml?</div=
><div><br></div><div>One quick question here before I send my email.=C2=A0 =
How much does OCaml depend on C?=C2=A0 I know that Python and Ruby are esse=
ntially very large "C applications" in the sense that the interpr=
eters for those languages are coded in the C language. =C2=A0( Or at least =
that's what I have read online. ) =C2=A0What about OCaml.=C2=A0 How is =
OCaml's compiler implemented?=C2=A0 Is the OCaml compiler written in C?=
=C2=A0 Or written in something else?</div><div><br></div><div>I appreciate =
your feedback and thanks!</div><div><br></div><div>Best,</div><div><br></di=
v><div>Douglas Lewit</div><div><br></div></font></div></div>
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#ygrp-msg p a {
font-family: Verdana;
}
#ygrp-msg p#attach-count span {
color: #1E66AE;
font-weight: 700;
}
#ygrp-reco #reco-head {
color: #ff7900;
font-weight: 700;
}
#ygrp-reco {
margin-bottom: 20px;
padding: 0px;
}
#ygrp-sponsor #ov li a {
font-size: 130%;
text-decoration: none;
}
#ygrp-sponsor #ov li {
font-size: 77%;
list-style-type: square;
padding: 6px 0;
}=20
#ygrp-sponsor #ov ul {
margin: 0;
padding: 0 0 0 8px;
}
#ygrp-text {
font-family: Georgia;
}
#ygrp-text p {
margin: 0 0 1em 0;
}
#ygrp-text tt {
font-size: 120%;
}
#ygrp-vital ul li:last-child {
border-right: none !important;=20
}=20
-->
</style>
</head>
<!--~-|**|PrettyHtmlEnd|**|-~-->
</html>
<!-- end group email -->
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