Source with the whole alphabet in order of appearance
The challenge is to write as short a source as possible, where the English alphabet (in alphabetical order from top to bottom) "abcdefghijklmnopqrstuvwxyz" is a sub-sequence of the source code.
The first mentioning of the next expected letter is the only one that counts. If a letter appears earlier on than expected, then it does not count.
That is: if the letter a is the next expected letter, then in the source b;abs;c; the a counts and everything before it is ignored. The next expected letter in the alphabet is b, which is found immediately as the next letter in abs. That a b existed earlier on in the source has no relevance. Similarly, the s at the end of abs fills no purpose as the next expected letter is now c. And so on, until the whole alphabet has been found in the source.
- Identifiers, variable/function names, string literals, integer/floating point constants (like 0xABCDEF) or anything else that can be named by the programmer do not count towards iterating through the alphabet.
- Only keywords, function names or identifiers provided by the language's standard/default libraries count.
- A solution may use non-standard libraries in which case it becomes a separate "language x + library y" solution.
- Comments are not allowed anywhere in the source.
- The program need not do anything meaningful but must compile cleanly (no language syntax or constraint violations etc) and execute without any crashes or exceptions thrown.
- Function-only answers are accepted and encouraged.
- Any library includes at the top of the program are free and do not count towards the total (if using tio.run, you may put such in the header section).
- The challenge is case-insensitive, accepting both upper and lower case letters.
- This is code golf, the shortest source that fulfil the requirements wins.
Non-golfed example of a correct solution in standard C:
C (gcc), 217 bytes
void func (void)
{
fabs;cos;
#define x long
acosh;
printf("hello world");
jmp_buf j;
isblank;
long _Atomic l;
alignof(int);
puts;
qsort;qsort;
NULL;
(void)pow;
fmax;
INFINITY;
sizeof j;
}
To go through this source, func is an identifier and does not contribute to the solution (but to the total amount of characters for code golf like usual). Neither does x, "hello world" etc. We find the alphabet as follows (bold text):
void func (void) { fabs;cos; #define x long acosh; printf("hello world"); jmp_buf j; isblank; long _Atomic l; alignof(int); puts; qsort;qsort; NULL; (void)pow; fmax; INFINITY; sizeof j; }
Vyxal, 27 bytes ``` Qabcd …
1mo ago
Python, 88 bytes ```python …
1mo ago
Bash + a ton of non-standard p …
1mo ago
Japt, 26 bytes aBcDeFgH …
28d ago
TI-BASIC, 23 bytes Like lyx …
18d ago
5 answers
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Vyxal, 27 bytes
QabcdefghijKlmnopqrstUvwxyz
Works by exiting straight away. The joys of a language where every letter is a built-in function.
Explained
QabcdefghijKlmnopqrstUvwxyz
Q # Terminate the program
a # Are any of the items in the (non-existent) input truthy?
b # Convert that to binary
c # Is that in the input?
d # Double the result of that
e # input ** that
f # Flatten into a list of digits
g # Get the smallest digit
h # Push digit[0]
i # and get the inputh digit of that
j # Join the input on the result. This will give a string.
K # All non-empty substrings of the stringthat occur more than once in the string
l # Get the pairwise overlaps of that list
m # And mirror it
n # Push the string "abcdefghijklmnopqrstuvwxyz"
o # And remove that from the mirrored list
p # Prepend that to the input
q # Surround in backticks, escaping backslashes and existing backticks
r # Does the input contain a regex match of that?
s # Sort that
t # Push that[-1]
U # Uniquify the result
vw # Wrap each item
x # Call this program all over again
yz # Incidentally, this is never executed, but then again, neither is the entire program after the first Q. :p
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Python, 88 bytes
import abc,code,fcntl,graphlib,json,pickle,cmd,errno,heapq,re,struct,csv,pwd,xml,sys,bz2
Requires a Unix-like operating system for fcntl and pwd, and at least version 3.9 for graphlib.
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Bash + a ton of non-standard packages that were already installed on my machine, non-competing 83 bytes
tabs #bash: set tabs on a terminal
cd #bash: change directory
efibootmgr #linux: modify the EFI boot manager
ghh #git: alias of git help
dijkstra #graphviz: reads a stream of graphs and for each computes the distance of every node from sourcenode.
lmdown #flexLM : shut down the FlexLM licence manager daemon
open #linux : open program on a new virtual terminal
qrencode #qrencode: encode stdin as QR code
gstu #git: alias of git stash push --include-untracked
vmware-user #vmware: daemon that allows drag-and-drop and clipboard sync to the VM guest running this
gssproxy #libvirt: daemon to manage access to GSSAPI credentials.
zcat #gzip : cat but for gzipped input
So obviously this is very silly, hence non-competing, especially when you consider the stuff that's available on this machine (nobody except me has flexLM installed). To make it somewhat fair, I have not installed a single package to answer this, I simply looked at my available commands.
Technically, almost all of these will complain about missing arguments. this does not prevent bash from correctly executing each program and letting it print whatever it wants to stdout/stderr :)
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Japt, 26 bytes
aBcDeFgHiJkLmNoPqRsTuVwXyZ
Trivial Solution, 26 bytes
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Explanations
In the first solution each lowercase letter is a method that gets applied to its preceding uppercase letter, which is a predefined variable (except a which gets implicitly applied to the first input variable), and takes everything that follows as an argument. As the k method does not expect any arguments, everything that follows the k is essentially ignored.
aBcDeFgHiJkLmNoPqRsTuVwXyZ
a :Absolute difference between the first input (default 0) and
B : 11
c : Rounded up to the nearest multiple of
D : 13
e : Multiplied by 10 raised to the power of
F : 15
g : Sign of difference with
H : 32
i : Evalauate the following every H milliseconds and return an intervalID
J : -1
k : Prime factors
L : 100
m : Minimum with
N : Array of all inputs (empty)
o : Modify last element
P : Empty string
q : Split on
R : Newline
s : Sliced from (0-based index)
T : 0
u : Modulo
V : Second input variable (default 0)
w : Maximum with
X : Fourth input variable (default 0)
y : GCD with
Z : Sixth input variable (default 0)
:Implicit output of result (-1)
The second solution is just all of Japt's built-in variable names, each of which has a default value, with the value of the last one being output. To explain the 13 that aren't included above:
A :10
C :12
E :14
G :16
I :64
K :Date object
M :Math object
O :What I call the "Other" object, which includes miscellaneous methods such as string compression, explicit output and console.log
Q :Quotation mark
S :Space
U :First input variable (default 0)
W :Third input variable (default 0)
Y :Fifth input variable (default 0)
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TI-BASIC, 23 bytes
Like lyxal's answer, this program exits immediately, so nothing after the Stop is executed.
The program
Stop
GarbageCollectDetectAsymOffDispGraphiconj(BLACKClrfHomenormalpdf(SeqaClrAllListsFullvwAxesgetKeyZStandard
For those who are wondering, the reason this program is less than 26 bytes is that in TI-BASIC, while the user is shown long words for builtins like DispGraph, what's actually being stored in the program memory is a smaller number of bytes. So, while BLACK is five characters long, behind the scenes it's a number that's two bytes in memory.
As a result, builtin functions and variables and such are treated as single characters when editing. So pressing the del key once would delete the entire word BLACK.
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