bitcoin-math

Providesw number prototypes for converting between BTC and Satoshi values. It uses string based parsing, which avoids JavaScript's nasty problem of doing weird things with integer division.

Also adds a zeropad method for making full length BTC strings

If imported and used as var btcMath = require('bitcoin-math') you can use btcMath.getRandomBitcoin() and btcMath.getRandomSatoshi(). If you do not need these, you can simply import the module without assigning it to a variable and still use the number prototypes.

TOC

• Number.toBitcoin()
• Number.toSatoshi()
• Number.zeroFill()
• #getRandomSatoshi()
• #getRandomBitcoin()

Number.toBitcoin()

should add the toBitcoin function to the Number object.

var num = 1;
assert(num.toBitcoin);

should return a bitcoin value derived from the number.

var satoshi = 10000000;
assert(satoshi.toBitcoin() === 0.1);

should return NaN if the original is NaN.

var bad = NaN;
assert(isNaN(bad.toBitcoin()));

Number.toSatoshi()

should add the toSatoshi function to the Number object.

var num = 1;
assert(num.toSatoshi);

should return a satoshi value derived from the number.

var bitcoin = 1;
assert(bitcoin.toSatoshi() === 100000000);

should return NaN if the original is NaN.

var bad = NaN;
assert(isNaN(bad.toSatoshi()));

Number.zeroFill()

should add the zeroFill function to the Number object.

var num = 1;
assert(num.zeroFill);

should return a decimal with zeros added (1 => 1.00000000).

var bitcoin = 1;
assert(bitcoin.zeroFill() === "1.00000000");

should return a decimal with zeros added (1.123 => 1.12300000).

var bitcoin = 1.123;
assert(bitcoin.zeroFill() === "1.12300000");

should return NaN if the original is NaN.

var bad = NaN;
assert(isNaN(bad.zeroFill()));

#getRandomSatoshi()

should reurn an integer value between the specified values with specified non zero digits.

var rand = btcMath.getRandomSatoshi(100, 10000);
assert(rand > 100);
assert(rand < 10000);
var nonZeros = rand.toString().replace(/0/g, "").length;
assert(nonZeros <= 2);

#getRandomBitcoin()

should reurn a float value between the specified values with specified non zero digits.

var rand = btcMath.getRandomBitcoin(1, 100, 4);
assert(rand > 1);
assert(rand < 100);
var nonZeros = rand.toSatoshi().toString().replace(/0/g, "").length;
assert(nonZeros <= 4);