hillerstorm/LICENSE.txt

## README.md

      
    Raw
  

              README.md
            
          
    Swedish social security number validator

A Swedish social security number is composed of 10 digits in two groups, 6 and 4 digits each.
The groups are separated by a dash (changes to a + when a person is 100 years old or more).
Birth date  Checksum
   ||||||    |
   811218-9876
          |||
        "Birthnumber"

The first 6 digits are the birth date (yyMMdd).
The next 3 digits is an identifier where the last digit indicates the persons gender - even numbers for women, odd for men.
The last digit is a checksum, calculated using the Luhn algorithm.
Example of applying the algorithm on the social security number above:
                     8 1 1 2 1 8 - 9 8  7 x
Double every other  16 1 2 2 2 8  18 8 14 x
Sum of digits        7 1 2 2 2 8   9 8  5 =44

This sum you multiply by 9 (44 * 9 = 396) and the last digit, 6 in this case, is your checksum.
PS! This doesn't check for a valid birth date, just the format and checksum.

  
## annotated.js
function(
    a, // social security number
    b, // placeholder
    c, // --||--
    d  // --||--
    ){
    c='';
    // we're only interested in the first 10 chars (9 digits)
    // using a second index to skip the dash while still maintaining
    // an index to check for even/odd
    for(b=d=0;b<10;b++)
        c+=b!=6              // if we're not on the dash
            ?a[b]*(d++%2||2) // multiply the value with 2 if needed
            :'';             // skip the dash
    b=0; // reset the index to use as a sum

    // sum all the digits
    for(d in c)
        b+=c[d]*1;

    // multiply the sum by 9 and check if the last digit of the checksum
    // matches the last digit of the input
    return b*9%10==a[10]
}

## index.js
function(a,b,c,d){c='';for(b=d=0;b<10;b++)c+=b!=6?a[b]*(d++%2||2):'';b=0;for(d in c)b+=c[d]*1;return b*9%10==a[10]}

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

 Copyright (C) 2013 Johan Hillerström <https://github.com/hillerstorm>

 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": "swedishSocialSecurityNumberValidator",

  "description": "Validates the format and checksum of a Swedish social security number.",

  "keywords": [
    "validation",
    "swedish",
    "socialsecuritynumber"
  ]
}

## test.html
<!DOCTYPE html>
<title>Swedish social security number validator</title>
<div>Expected value: <b>true</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
  var validate = function(a,b,c,d){c='';for(b=d=0;b<10;b++)c+=b!=6?a[b]*(d++%2||2):'';b=0;for(d in c)b+=c[d]*1;return b*9%10==a[10]}

  document.getElementById('ret').innerHTML = validate('811218-9876')
</script>
	function(
	a, // social security number
	b, // placeholder
	c, // --\|\|--
	d // --\|\|--
	){
	c='';
	// we're only interested in the first 10 chars (9 digits)
	// using a second index to skip the dash while still maintaining
	// an index to check for even/odd
	for(b=d=0;b<10;b++)
	c+=b!=6 // if we're not on the dash
	?a[b]*(d++%2\|\|2) // multiply the value with 2 if needed
	:''; // skip the dash
	b=0; // reset the index to use as a sum

	// sum all the digits
	for(d in c)
	b+=c[d]*1;

	// multiply the sum by 9 and check if the last digit of the checksum
	// matches the last digit of the input
	return b*9%10==a[10]
	}
	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2013 Johan Hillerström <https://github.com/hillerstorm>

	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": "swedishSocialSecurityNumberValidator",

	"description": "Validates the format and checksum of a Swedish social security number.",

	"keywords": [
	"validation",
	"swedish",
	"socialsecuritynumber"
	]
	}
	<!DOCTYPE html>
	<title>Swedish social security number validator</title>
	<div>Expected value: <b>true</b></div>
	<div>Actual value: <b id="ret"></b></div>
	<script>
	var validate = function(a,b,c,d){c='';for(b=d=0;b<10;b++)c+=b!=6?a[b](d++%2\|\|2):'';b=0;for(d in c)b+=c[d]1;return b*9%10==a[10]}

	document.getElementById('ret').innerHTML = validate('811218-9876')
	</script>