For a computer language, a reserved word is a word that cannot be used as an identifier, such as the name of a variable, function, or label. For other computer languages, keywords can be considered as the set of the language instructions.


Using your language of choice, write a code in the chosen language that given a number between one and ten, 1<=n<=10, outputs any n reserved words (keywords) of the chosen language.


  • If the chosen language is case sensitive the outputted keywords must be also.
  • If the chosen language is not case sensitive the outputted keywords can be in any case.
  • If the chosen language has less than 10 keywords saying p, the code must output all the reserved words for any n between p and 10.
  • If possible specify in the answer whether you consider operators as keywords or not.

Possible samples for Java (JDK10)

  • n=1 --> true
  • n=3 --> try new interface
  • n=4 --> continue this long break

Possible samples for ><>

  • n=1 --> >
  • n=3 --> > < ^
  • n=4 --> > < \ /

Possible samples for Brain-Flak

  • n=1 --> (
  • n=3 --> ( ) [ ]
  • n=9 --> ( ) [ ] { } < >


  • The input and output can be given in any convenient format.
  • No need to handle invalid input values, valid inputs are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
  • Either a full program or a function are acceptable. If a function, you can return the output rather than printing it.
  • If possible, please include a link to an on-line testing environment so other people can try out your code!
  • Standard loopholes are forbidden.
  • This is so all usual golfing rules apply, and the shortest code (in bytes) wins.
  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – Mego Apr 19 '18 at 2:29
  • 2
    \$\begingroup\$ continue this long break I wish! That's why I'm on SE! \$\endgroup\$ – Stan Strum Apr 24 '18 at 18:09
  • \$\begingroup\$ the integers are reserved but I guess that would be a loophole. \$\endgroup\$ – snoram Aug 2 '18 at 13:56

33 Answers 33


MATL, 5 bytes


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The lowercase alphabets all correspond to builtins in MATL, so this outputs the first n lowercase letters.

For a version with a smile, there's:


at 6 bytes.

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Julia 0.6, 59 bytes

n->split("if do for try let end type else true macro")[1:n]

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Using the list of reserved keywords from julia-parser.scm.

An operators-included version gets quickly confusing, as to what is an operator and what is a syntactic indicator (like @ for a macro). Going by julia-parser.scm again, a bunch of operators are termed "syntactic operators" and can't be assigned to or overloaded by the user (so fit the definition of "reserved"). Some of these are:

Julia 0.6, 45 bytes

n->split("= : :: && || ... >: <: -> .=")[1:n]

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Cubix, 12 bytes

Based on some of the other answers I think this should qualify for reserved words. I avoided using the numeric literals as I thought that might be stretching the definition a bit far.


Try it online!

This wraps onto the cube as follows

    S o
    I ;
W ( > ! @ + / $
. . . . . . . .
    . .
    . .

Watch it run

  • WSI change lane, push 32 and get input. This sets up the stack with 32 and the input value.
  • >!@ redirect, test for 0 and halt if true.
  • +/o; add stack items, reflect onto top face, output character and pop the sum.
  • !/$W( redundant test, reflect, skip the lane change, decrement the input and back into the main loop.

Output for 10


* multiply the top two items on the stack
) increment the TOS value
( decrement the TOS value
' push the next character's value to the stack
& pop top two items (integers) of the stack, concatenate and push the int result
% take modulo of top two stack items
$ Skip the next command
# push the stack length
" start and end of string literal.  Character codes of string are pushed to the stack
! test for truthy and skip next command if true
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