mjschwart/LICENSE.txt

## README.md

      
    Raw
  

              README.md
            
          
    ISBN Number Validation - 140byt.es

An ISBN validation function.
Inspiration for this came from: http://java.dzone.com/articles/thursday-code-puzzler-isbn

  
## annotated.js
function v(
  a,  // ISBN number to validate
  b,  // sum of digits (for ISBN algorithm) (placeholder)
  c,  // counter (placeholder)
  d   // current digit (placeholder)
){
  for(
    b = 0,                // initialize sum
    c = a.length-1;       // skip the last character of the string (check digit)
    c--;                  // work through the string backwards
  )
    d = +a[c],
    b +=                  // sum for ISBN algorithm..
      c % 2 ?             // if the counter is even or 0..
        d * 1             //   add the current digit times 1 to the sum
        :                 // else
        d * 3;            //   add the current digit times 3 to the sum

  return +a[a.length-1] == 10 - b % 10  // return true if the last digit equals
                                        // the calculated check digit
                                        // (10 minus sum mod 10)
}

## index.js
function v(a,b,c,d){for(b=0,c=a.length-1;c--;)d=+a[c],b+=c%2?d*1:d*3;return+a[a.length-1]==10-b%10}

## LICENSE.txt
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.

## package.json
{
  "name": "isbnValidator",

  "description": "An ISBN number validation function.",

  "keywords": [
    "isbn",
    "validation"
  ]
}

## test.html
<!DOCTYPE html>
<title>Foo</title>
<div>Expected value: <b>true</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
  // write a small example that shows off the API for your example
  // and tests it in one fell swoop.

  var myFunction = function(a,b,c,d){for(b=0,c=a.length-1;c--;)d=+a[c],b+=c%2?d*1:d*3;return+a[a.length-1]==10-b%10}

  document.getElementById( "ret" ).innerHTML = myFunction("9780306406157")
</script>
	function v(
	a, // ISBN number to validate
	b, // sum of digits (for ISBN algorithm) (placeholder)
	c, // counter (placeholder)
	d // current digit (placeholder)
	){
	for(
	b = 0, // initialize sum
	c = a.length-1; // skip the last character of the string (check digit)
	c--; // work through the string backwards
	)
	d = +a[c],
	b += // sum for ISBN algorithm..
	c % 2 ? // if the counter is even or 0..
	d * 1 // add the current digit times 1 to the sum
	: // else
	d * 3; // add the current digit times 3 to the sum

	return +a[a.length-1] == 10 - b % 10 // return true if the last digit equals
	// the calculated check digit
	// (10 minus sum mod 10)
	}
	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

	0. You just DO WHAT THE FUCK YOU WANT TO.
	{
	"name": "isbnValidator",

	"description": "An ISBN number validation function.",

	"keywords": [
	"isbn",
	"validation"
	]
	}
	<!DOCTYPE html>
	<title>Foo</title>
	<div>Expected value: <b>true</b></div>
	<div>Actual value: <b id="ret"></b></div>
	<script>
	// write a small example that shows off the API for your example
	// and tests it in one fell swoop.

	var myFunction = function(a,b,c,d){for(b=0,c=a.length-1;c--;)d=+a[c],b+=c%2?d1:d3;return+a[a.length-1]==10-b%10}

	document.getElementById( "ret" ).innerHTML = myFunction("9780306406157")
	</script>