76
votes
Print some JSON
Python 2, 14 bytes
print{`str`:1}
Outputs:
{"<type 'str'>": 1}
The backticks get the string representation in Python ...
- 147k
42
votes
Print some JSON
jq, 6 characters
(3 characters code + 3 characters command-line option.)
env
CW because I am sure this is not the kind of answer you intended to allow.
Sample ...
35
votes
33
votes
Print some JSON
Jelly, 11 bytes
“Ɠɼ'ẸẠḌȷżÑ»
Try it online!
Output
{"Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch":0}
- 211k
32
votes
31
votes
What an Odd Function
Jelly, 7 bytes
Æf^<¥4P
Swaps 2s and 3s in the input's prime factorization. The probability of odds is 2/3.
Try it online!
How it works
...
- 211k
30
votes
Egyptian fraction representations of 1
Python 2, 42 bytes
f=lambda n,x=1:1/n*[x]or[x+1]+f(n-1,x*-~x)
Try it online!
The key thing to observe is that ...
- 22.9k
27
votes
Give me odd, even, square, cube, prime and composite 3-digit numbers
Python 2, 25 22 bytes
lambda s:hash(s)%591^1
Try it online!
Takes input in upper case and returns the following numbers:
...
- 60.6k
26
votes
Infinitely many ℕ
Scratch 3.0, 13 20 blocks/121 70 bytes
As SB Syntax:
define(n)(i
say(i
((n)+<(i)=(n)>)((1)+((i)*<(i)<(n
This says each term in the sequence. A delay ...
- 34.3k
26
votes
Be big more often
Python, 41 bytes
lambda l:choices(l,l)
from random import*
Attempt This Online! or run it 100000 times
Uses the list itself as the weights.
- 783
23
votes
Print some JSON
Notepad, 7 keystrokes
If you have a Windows computer with the Notepad program, type this:
{"F5":0}
On my Windows 7 computer, at least, this gives you something like:
...
- 50.1k
21
votes
Accepted
Demonstrate some advanced abstract algebra
Proof of impossibility
The only anti-distributive operator when \$S=\mathbb Z\$ is such that \$\forall a, \forall b, a*b=0\$.
Indeed, suppose that \$*\$ is anti-distributive. Then \$*\$ has the ...
- 15.6k
20
votes
f(g(x)) decreases while g(f(x)) increases
Python, 68 characters
f=lambda x:(1-x%2*2)*(2*x*x+(x<0))
g=lambda x:(1-x%2*2)*(2*x*x+(x>0))
f maps negative numbers to odd numbers and positive numbers to ...
- 3,864
20
votes
Bijective function ℤ → ℤⁿ
Alice, 14 12 bytes
/O
\i@/t&Yd&
Try it online!
Inverse function (not golfed):
/o Q
\i@/~~\ /dt&Z
Try it ...
- 197k
19
votes
Infinitely many ℕ
Husk, 2 bytes
ḣN
Try it online!
First Husk answer! Also uses the sequence in the question
How it works
...
- 50.3k
18
votes
Injection from two strings to one string
brainfuck, 30 29 27 23 bytes
,[-[+.>]-[>+<---]>.-.,]
Try it online!
Inputs are separated by a 0x01 byte.
This ...
- 71.7k
18
votes
Enumerate all pure sets
Python, 43 bytes
f=lambda x:[f(i)for i in range(x)if x>>i&1]
Attempt This Online!
Outputs the \$ n \$th set, starting at \$ 0 \$.
One way of creating a sequence of all pure sets is to encode ...
- 24.6k
18
votes
Create a nibble shorthand
MATL, 12 7 bytes
t~Pv1YG
Input is a 4-digit binary vector.
Example outputs (or try it at MATL Online!):
Input [0 1 0 0]:
...
- 105k
17
votes
Print some JSON
Java (JDK 10), 20 bytes
v->"{\"\":"+1/.3+"}"
Try it online!
Output
{"":3.3333333333333335}
- 14.4k
17
votes
Golf a bijection within the natural numbers which map the primes to a proper subset of the primes
Mathematica, 54 48 bytes
±(t=x_?PrimeQ)=NextPrime@x
±n_:=Abs[n-1]/.t:>x-1
Defines the following bijection:
...
- 197k
17
votes
Walk Across a Keyboard
Python 2, 83 bytes
lambda s:re.findall('.*?'.join(s),'qwertyuioplkmnjhbvgfcxdsza'*len(s))[0]
import re
Try it online!
Walks the entire keyboard until the word ...
- 19.9k
17
votes
Injection from two strings to one string
JavaScript (ES6), 14 bytes
Takes input as an array of 2 strings. Inspired by Luis' answer.
JSON.stringify
Try it online!
JavaScript (ES6), 21 20 bytes
Takes ...
- 198k
17
votes
Output an infinitely proportional sequence
05AB1E, 2 bytes
Óθ
Attempt This Online!
Returns the exponent of the largest prime factor of \$n\$.
Proof of correctness
Let's look at the ratio between the number ...
- 10.7k
16
votes
f(g(x)) decreases while g(f(x)) increases
CJam (17 bytes)
Function f (named F because CJam only allows upper-case names):
{W1$2b,#*}:F
Function g (anonymous):
...
- 43.1k
16
votes
f(g(x)) decreases while g(f(x)) increases
Python, 40 bytes
f=lambda x:x*(-1)**x
g=lambda x:3*f(x)+1
Try it online! Some outputs are floats that equal integers because ...
- 147k
16
votes
Transform characters of your choice into "Hello, world!"
Perl 5, 8 bytes
−1 byte by Sisyphus.
y;yav;ol
Input: Heavy, world! Try it online!
- 40.1k
16
votes
Print 4 billion if statements
Python 3, 70 bytes
print("def f(n):f",*range(2**33),sep="==n==print('eovdedn'[n&1::2]);")
Try it online (with ...
- 147k
15
votes
Print some JSON
JavaScript, 17 15 bytes
Thanks to @Neil for this one. Call with no input.
_=>`{"${_}":0}`
Outputs ...
- 4,146
Only top scored, non community-wiki answers of a minimum length are eligible