text:
Fibonacci in +!()[]script
Write a piece of JavaScript code that calls alert with an array containing the first 50 Fibonacci numbers in order. You may only use the following characters: +!()[].
As a reference, your code must be functionally equal to the following:
var fib = [], a = 1, b = 1;
for (var _ = 0; _ < 50; _++) {
    fib.push(a);
    var t = a; a = b; b = t + a;
}
alert(fib);

You may not assume any content on the webpage - your program will be run in the console on about:blank. Similarly, you may not 'cheat' and store any settings in cookies, settings or other data. Your solution must work on any fresh install of the latest Google Chrome or Firefox on any OS. When in doubt, try to remain as portable as possible.

Smallest source code in bytes wins.

Could the downvoter explain what's wrong with the challenge?

By functionally equal do you mean that the solution must simulate for loops and appending variables, or do you just mean that the end result must be the same?

Downvotes may be due to the fact that this challenge, being single-language and fixed output, must have a single best solution. That's a bit frowned upon as it takes away some of the fun.

@BrainSteel Only the end result has to be the same.

@JohnE There is no way this question could even exist without being restricted to a single language, so that's not a valid concern. It is only a concern if the question would be more fun if the restriction was lifted, which in this case is impossible. As for a single best solution, I don't think anyone will even get close - it's very complicated.

@trichoplax Hardcoding is a valid strategy.

@orlp Do we have to use , as a separator?

Voting to close. "Too broad" but really it's too narrow IMHO.

+1 Upvoting just because some of the criticism is absolutely ludicrious. A single best solution is always the case (and that's a good thing as well as it's still a Q&A site) and a challenge like this only makes sense when limited to a specific language (I mean, the skill is in finding a way to make the code shorter not in cheating by using a language that is inherently shorter).

@DavidMulder I wouldn't upvote to cancel out the downvotes as it is highly frowned upon. Meta: http://meta.stackoverflow.com/questions/253383/upvotes-that-cancel-out-downvotes

@vihan You're not allowed to use ,.

@orlp could you run the code on Firefox? That'll allow us to use ES6 features.

@vihan That's ok.

Maybe it would be better to generate the JS code. We have the [metagolf] tag for that. All languages allowed, no one complains. Answers can even be readable! It's actually not too late to change the rules now.

7,576 chars
Firefox / Safari 9 (WebKit Nightly)
The main byte-saver is fill()
alert(Array(48).fill().reduce(falsefalse=>falsefalse.unshift(falsefalse[1]+falsefalse[0]),falsefalse},[1,1]).reverse())

Most non-alphanumeric characters (especially ; and >) are very expensive so I'm really trying to minimize their use.
Script
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Chrome (11,605)
Original:
; is very expensive.
alert(Array(48).join(0).split(0).reduce(function(falsefalse){return falsefalse.unshift(falsefalse[1]+falsefalse[0]),falsefalse},[1,1]).reverse())

Script: Pastebin.

Hey Vihan, I mentioned this on another answer, but falsefalse as a variable name is fewer chars than t or f or anything, might help you shave a few more off! Shame we can't produce more numbers than 50 though because 50 is shorter than 48...

@DomHastings would it help to generate two too many and then pop them before printing?

@JanDvorak Doesn't look like it, tried combinations of .pop(), .shift() and .splice() but they all add too many chars! Think @vihan has it covered! If alert()ing at each stage is acceptable it could be possible to skip the reverse entirely though, but I feel that's a bit rule-breaky...

15,943 bytes
I just hardcoded the values and used the JScrewit Compiler.
Original Code:
alert([1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181,6765,10946,17711,28657,46368,75025,121393,196418,317811,514229,832040,1346269,2178309,3524578,5702887,9227465,14930352,24157817,39088169,63245986,102334155,165580141,267914296,433494437,701408733,1134903170,1836311903,2971215073,4807526976,7778742049,12586269025])

JSFuck Code:

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Although hardcoding is longer than a golfed generator in normal js, numbers are (comparatively ;P) easily represented in JsFuck.

30287 12419 12288  Bytes
Original golf:
for(f=[1,1],t=1;t<49;)f.push(f[t-1]+f[t++]);alert(f)

Unshift and Reverse are cheaper than Push for a slight saving:
for(f=[1,1],t=48;t;t--)f.unshift(f[0]+f[1]);alert(f.reverse())

    Doesn't fit! 30K character limit!
Pastebin here.
I tried jsfuck.com but that gave me 62399 bytes.
Following the suggestion of Stefnotch, changed compatibility to Chrome only and slashed the count dramatically.
JSFuck generated by jscrew.it:
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You can include results that don't fit within SE's character limit by linking to a pastebin or similar.

You can make your answer a lot shorter by setting the compatibility to Custom and then only selecting Chrome. "Your solution must work on any fresh install of the latest Google Chrome on any OS." That way, you could beat the current best answer.

12,285 12183 12069 11399 11252 11105 Bytes
Original code:
f=[1,1];for(i=0;i<48;)f.push(f[i++]+f[i]);alert(f)

After removing semicolon and replacing it with '\n': (Thanks Dom Hasting.)
f=[1,1]
for(i=0;i<48;)
f.push(f[i++]+f[i])
alert(f)

Using 'concat' instead of 'push' to save some bytes:
f=[1,1]
for(i=0;i<48;)
f=f.concat(f[i++]+f[i])
alert(f)

Updated code:
falsefalse =[1,1]
for(false0=0;false0<48;)falsefalse=falsefalse.concat(falsefalse[false0++]+ falsefalse[false0])
alert(falsefalse)

Removing empty space:
falsefalse=[1,1]
for(false0=0;false0<48;)falsefalse=falsefalse.concat(falsefalse[false0++]+ falsefalse[false0])
alert(falsefalse)

Removing empty space after '+':
falsefalse=[1,1]
for(false0=0;false0<48;)falsefalse=falsefalse.concat(falsefalse[false0++]+falsefalse[false0])
alert(falsefalse)

JSFuck Code:
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Hey Vasu, you might be able to save bytes using falsefalse and false0 as the variable names instead of t and f and \n is fewer chars than ; (according to jscrew.it anyway) so you mgiht be able to replace those for a saving too. If it's possible to show the first 52 numbers, 50 is half the size of 48 too... Hope that helps!

No problem at all, glad to have been able to help! You can remove the extra newline between the for(i=0;i<48;) and f.push for more of a saving and replacing the variable names will definitely save some f = (![]+[])[+[]] vs.  falsefalse = ![]+[![]] and i = ([![]]+[][[]])[+!![]+[+[]]] vs. false0 = ![]+[+[]]. concat was the only other way I could see to help reduce that method too!

Wow that reduced a lot. Thanks again :)

Firefox, 7446 bytes
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Source:
[].fill.constructor('[...[falsefalse=[1,1]].fill+false+false].reduce('+[].fill.constructor('falsefalse.unshift(falsefalse[1]+falsefalse[0])')+'),alert(falsefalse.reverse())')()

14,097 Bytes
First time doing one of these or coding in this language so I will come back and see if I can get it smaller
Original code:
for(i=1;i<51;i++){alert(Math.floor(((Math.pow(1.618033988749, i)/2.2360679775)+.5)))}

JSFuck Code:
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text:
Can I make that shape with blocks, slabs, and stairs?
Consider a rectangular two-dimensional grid where each cell can either be empty (.) or full (0).
e.g.
..00....
0000....
.00000..
000...00
..000000
000.00..

The grid is considered infinite, all cells outside the depicted region are empty.
The goal is to cover the filled spaces and leave the empty spaces open using a set of 7 distinctly shaped bricks that each take up 4 cells (2×2) of the grid.
These are the 7 bricks:

Blocks - 1 variant
11
11

Slabs - 2 variants
..
22
33
..
Stairs - 4 variants
.4
44
5.
55
66
.6
77
7.

These bricks must always align to a grid whose cells are twice as wide and tall as the cells of the input grid. Each brick can only occupy one cell of this larger grid but the smaller grid can be translated (shifted up, down, left, right) beneath the larger grid to give more options for finding a cover. Neither of the grids nor individual bricks may be rotated.
So one way to cover (a.k.a. solve) the example above is like this:
..11....
2211....
.47733..
447...22
..771133
227.11..

(Identical neighboring bricks can still cause ambiguity but carefully identifying the larger grid resolves that.)
An invalid solution for
000000
000000

is
566774
556744

because the bricks do not all align to the larger grid nor only occupy one cell of it.
A valid solution here is 3 blocks in a row:
111111
111111

And another valid solution involves 6 slabs:
......
222222
333333
......

So note that some input grids have multiple solutions.
An invalid solution for
00.00
00...

is
11.33
11...

because the bricks don't align to the larger grid. The slab would need to move left or right by one, but then of course the cover would be incomplete. This input grid has no solution.
Challenge
Write a program that takes in (via stdin/command line) a rectangular block of text of .'s and 0's that represents a grid to be covered.
If there is a valid covering solution, print (via stdout) any one solution in the same manner as above, replacing all 0's with the appropriate 1 through 7 bricks.
If there is no solution, your program should not output anything, just quietly end normally.
Notes

The input and output do not need to have the same rectangular dimensions. Your output can have extraneous rows and/or columns of all .'s (as long as they don't invalidate the solution).
It's also alright to trim rows and column's of all .'s if it won't affect the filled spaces. e.g.
222222
333333

is a valid solution to
000000
000000

Conversely, the two empty columns in 00..00 could not be removed since that would disarrange the filled spaces.
You may optionally assume the input has a single trailing newline. A single trailing newline in the output is fine as well, even in the case of no solution.
Grids that are completely empty (all .'s) and the trivial 0×0 grid are not input cases you need to worry about. But the 1×1 0 grid is, as are all other grids that contain at least one 0. (You may not assume the width or height of the input grid is even!)
Instead of a program you may write a function that takes the input as a string argument and prints the output normally or returns it as a string. Any falsy value can be returned if there is no solution.
You may use any 9 distinct printable ASCII characters in place of . 0 1 2 3 4 5 6 7. Just be sure to say what your substitutions were! Newlines must remain as is.

Scoring
The shortest code in bytes wins. Tiebreaker is highest voted post.
This challenge was inspired by blocks, slabs, and stairs in Minecraft, which follow the same rules described here. If you enjoy PPCG and Minecraft, you may want to check out the PPCG Minecraft Server.

It seems the Minecraft server is not implemented in Golf script - boring :-)

@ThomasWeller It was reimplemented in CJam to save a few bytes.

Python - 525 491 478 430 bytes
r=range
def t(s):
 m=s.find("\n")+1
 for q in r(4):
  try:
   for i in r(-q%2,m-1,2):
    for j in r(-q/2,len(s)/m,2):
     k,g=j*m+i,""
     b=[k,k+1,k+m,k+m+1]
     for z in b:g+=a(s,z)
     for z in b:
      if a(s,z)!="d":s=s[:z]+`dict(dddd=0,zzdd=3,ddzz=2,zzzd=7,zzdz=6,zdzz=5,dzzz=4,zzzz=1)[g]`+s[z+1:]
   return s
  except:d
def a(v,i):
 try:
  if v[i]!="\n":return v[i]
  return "d"
 except:return "d"

Explanation: This is my first code golf, so it might not be optimal, but here's how it works. The function t(s) gives the result for the string passed in. First, it finds the number of columns, then goes through the four possible distinct translations by 1 (none, left, up, up-left) and tries to solve it for each one. It looks at each 2x2 block and maps it to a valid block number, given by a dictionary, and changes the zeros to the number.
If it finds one not in the dictionary, it abandons that specific offset and starts over with the next one. If it goes through all 4 offsets without finding a valid solution, it ends without outputting anything. a(v, i) allows for the default value outside the string, and ignores newline characters. Although it may end up with partial solutions through the duration of the run, it will always override them with the final correct one if it exists.
Edit: A different mapping of characters is used: . -> d, 0 -> z, all other numbers go to themselves. This applies to both input and output.

Welcome to PPCG! We have some tips for golfing in Python; by which I think you can save some bytes.

source: Stack Exchange

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/3.0/

sort: votes