base-conversion

Auto-curried converter between any bases with arbitrary precision support and customisable symbols

Install

npm i base-conversion

Basic usage

var bc = require('base-conversion');
var hexToBin = bc(16, 2);
 
hexToBin('A'); //=> '1010'
hexToBin('1E'); //=> '11110'

See spec.

Custom symbols

For any bases above 62, custom symbols are required. See tests for working examples.

var bc = require('base-conversion');
 
bc.symbols('⓿①②③④⑤⑥⑦⑧⑨ⒶⒷ', 8, 12, '⑦③'); //=> '④Ⓑ'

Symbol translation

To convert between different sets of symbols, use bc.translate:

var bc = require('base-conversion');
var pipe = require('ramda/src/pipe');
 
var hexToDuoNormal = bc(16, 12);
var hexToDuoCustom = pipe(hexToDuo, bc.translate('0123456789ᘔƐ'));
 
hexToDuoNormal('10B'); // => '1A3'
hexToDuoCustom('10B'); // => '1ᘔ3'

To use it to translate from custom symbols, use bc.translateRaw:

var mySymbols = '⓿①②③④⑤⑥⑦⑧⑨⑩⑪⑫⑬⑭⑮';
var myTranslate = bc.translateRaw(mySymbols);
 
var hexToDuoFancy = bc.symbols(mySymbols, 16, 12);
var hexToDuoCustom = pipe(hexToDuoFancy, myTranslate('0123456789ᘔƐ'));
 
hexToDuoFancy('①⓿⑪'); //=> '①⑩③'
hexToDuoCustom('①⓿⑪'); //=> '1ᘔ3'

Arbitrary precision

var bc = require('base-conversion');
var Big = require('arbitrary-precision')(require('bigjs-adapter'));
var toBigFactory = require('to-decimal-arbitrary-precision');
 
var d = toBigFactory(Big);
 
// avoid large numbers to go into exponential notation (adapter dependent)
Big.Impl.E_POS = 50;
 
bc.big(d, 10, 9, '5678364565345634563456346757364563534534645745');
//=> '802531310452364303450750087576673257456135727727'
 
// equivalent but it skips a trivial decimal to decimal conversion
bc.fromDecimal.big(d, 9, '5678364565345634563456346757364563534534645745');
//=> '802531310452364303450750087576673257456135727727'

Full raw version

var bc = require('base-conversion');
var Big = require('arbitrary-precision')(require('bigjs-adapter'));
var toBigFactory = require('to-decimal-arbitrary-precision');
 
var d = toBigFactory(Big);
 
// avoid large numbers to go into exponential notation (adapter dependent)
Big.Impl.E_POS = 50;
 
bc.raw(d, '01234#6789', 10, 9, '#678364#6#34#634#634#63467#7364#63#34#3464#74#');
//=> '802#313104#23643034#07#0087#766732#74#613#727727'
 
// equivalent
bc.fromDecimal.raw(d, '01234#6789', 9, '#678364#6#34#634#634#63467#7364#63#34#3464#74#');
//=> '802#313104#23643034#07#0087#766732#74#613#727727'

Defaults

The default symbols and big implementation are exposed as follows:

bc.defaultSymbols; //=> '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
bc.defaultB; //=> default arbitrary precision implementation (plus, times, div, mod & pow)