fibonacci

Calculate fibonacci numbers for one or endless iterations.

fibonacci

Module for node.js to calculate fibonacci numbers for one or endless iterations.

Using the bignum module it can return numbers of any size, instead of being limited by the hardcoded javascript Number.MAX_LIMIT.

Find one fibonacci number at 3000 iterations:

var fibonacci = require ('fibonacci');
var bigNumber = fibonacci.iterate (3000);
console.log (bigNumber);

Result:

{ number: '410615886307971260333568378719267105220125108637369252408885430926905584274113403731330491660850044560830036835706942274588569362145476502674373045446852160486606292497360503469773453733196887405847255290082049086907512622059054542195889758031109222670849274793859539133318371244795543147611073276240066737934085191731810993201706776838934766764778739502174470268627820918553842225858306408301661862900358266857238210235802504351951472997919676524004784236376453347268364152648346245840573214241419937917242918602639810097866942392015404620153818671425739835074851396421139982713640679581178458198658692285968043243656709796000',
length: 627,
iterations: '3000',
ms: 208 }

Get all numbers up to 4 seconds.

WARNING: it is very important that you run the iterate() function AFTER the .on('result') event, otherwise the iteration will continue forever without emitting the events!

fibonacci.on ('result', function (num) {
  console.log (num.iterations +' / '+ num.number +'\n');
  if (num.ms > 4000) {
    console.log ('Done!');
    fibonacci.kill ();
  }
});
 
// run this AFTER everything 
fibonacci.iterate ();

Here you see I use the result event to catch each result, the num.ms property to figure out how many milliseconds have passed and finally kill() to stop the iteration.

The 'bignum' dependency requires build essentials such as gcc and make. When you install this module with npm it might fail, but at least it will tell you which build tools you are missing. Refer to your OS community to figure out how to get them.

  • Debian/Ubuntu systems: sudo apt-get install build-essential
  • Mac OSX: install xCode Command Line Tools

Stable: npm install fibonacci

Run the iteration

max_iterations (optional) - limit the amount of iterations. Without this argument it will continue untill kill() is called or the process terminated.

Returns: the last result as object, with these elements:

  • number - the number as string
  • length - the number of digits
  • iterations - how many iterations it took
  • ms - duration in milliseconds

Stop the iteration loop.

Returns: nothing

Emitted when a result is found.

Callback parameters:

resultObject with these elements:

  • number - the number as string
  • length - the number of digits
  • iterations - how many iterations it took
  • ms - duration in milliseconds

Emitted when max_itereations is reached, see result event for details

Emitted when the iteration has stopped without user interaction. For now only used to catch infinite loops, if any.

Returns: object with these elements:

  • reason - string infinity,
  • max_limit - string value of Number.MAX_LIMIT,
  • last_result - resultObject of last result,
  • iterations - number of iterations ran,
  • intended - numbers of iteratios intended to run, or false when none

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to http://unlicense.org/

Franklin van de Meent | Website | Github