basek.js

Use an array of multi-character alphanumeric symbols to convert between bases exceeding 62.

Features

• Convert between a potentially infinite number of bases using an array representation of an alphabet.
• Predefined methods for converting between life's most popular bases (2,6,8,..62)
• Functionality that allows you to set your alphabet as a string or an array of strings
• Create your own convenience methods for converting between base(n) and base(k)
• Create a logically coherent chain of functions with the Basek object
  • set an alphabet -> convert to base -> pad with digits

Usage

Include in your Node.js project

var basek = require('basek');

Include as a standalone

<script src='basek.min.js'></script> // var basek = Basek()

=== The default alphabet is 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ which supports all base conversions up to 62.

Predefined convenience methods

basek.base10to2(15) // "1111"
basek.base10to16(15) // "f"
basek.base16to10("f") // "15"
basek.base2to10(1111) // "15" 

Defining a convenience method

basek.makeTag(2,16) 
// Basek.prototype.base2to16 and Basek.prototype.base16to2 are now defined
basek.base2to16(1111) // "f"
basek.base16to2("f") // "1111"

Generics

• Basek.prototype.toBase(n[, base])
• Basek.prototype.fromBase(n[, base])

Convert to/from decimal using these generics. If you don't provide a base parameter, Basek uses the length of your alphabet to determine the base.

basek.toBase(61).get() // "Z" 
basek.toBase(61,2).get() // "111110"
basek.fromBase("Z").get() // "61"
basek.fromBase("ff",16).get() // "255"

Alphabetic Representation

• Basek.prototype.alpha()
• Basek.prototype.alphaDefault()
• Basek.prototype.alphaSet('abc' || ['a','b','c'])
• Basek.prototype.alphaExtend('abc' || ['a','b','c'])

You can literally use any combination of multi-character symbols to extend Basek's alphabetic representation and thus extending your base limit. First here's some basic usage.

// Using only single character symbols
basek.alpha() 
// '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' - default base62
basek.alphaExtend('%^') 
// '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ%^' - base64
basek.alphaSet() 
// '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' - back to default
basek.alphaSet('abcdefghijklmnopqrstuvwzyz')
// 'abcdefghijklmnopqrstuvwzyz' - alphabet set
basek.toBase(15,2).get() // 'bbbb'

Now using multi-character alphanumeric symbols to extend Basek's base range to 100

basek.alphaSet() // '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' - back to default
for (var i = 0; i < 38; i++) {
  basek.alphaExtend(['a'+i]);
} // alphabet set to Array[100] (['0','1',...,'a37'])
basek.toBase(99).get() // 'a37' - your multi-character symbol representing decimal 99 in base100

Utility (more to come)

• Basek.prototype.pad(bits)
• Basek.prototype.unpad()

Use pad to prepend n bits (bit = character at the 0th index of your alphabet) to your string and unpad to slice the representation back to its original glory.

basek.alphaSet()
basek.toBase(15,2) // '1111'
basek.pad(10) // '0000001111'
basek.unpad() // '1111'

Chain several functions together

basek.alphaSet('ab').toBase(10).pad(10).get() // 'aaaaaababa'

License

MIT