This lib provides arithmetical operation with numbers of different length and precision. It was written on Ecmascript 6. You can watch tests and try it here (your browser has to support ES6.

Just add longArithmetic.js to your project.

Chrome enable chrome://flags/#enable-javascript-harmony

Firefox avaliable only in Firefox Developer Edition

new LongNumber(number) creates instance of a class. With no arguments creates number 0. Argument can be both String or Number. You can add exponent too new LongNumber('-4.35e-30').

compare(a, b) compares two long numbers. Returns 1 ==> a > b, 0 ==> a == b, -1 ==> a < b.

absCompare(a, b) works as compare(). Comparing by absolute value.

toLongNumber(n) Type conversion.

Methods below return new instance of LongNumber after doind operation

add(a, b)

subtract(a, b)

multiply(a, b)

divide(a, b, precision) (by default precision is 100)

toString returns LongNumber as a string.

invert() returns this number multiplyed by -1.

clone() returns copy of current item.

Methods below work as LongNumber.method(this, n)

add(n)

subtract(n)

multiply(n)

divide(n, precision)

isZero() isOne() isMinusOne() isPositive() isNegative()

All methods can get both Number and LongNumber as arguments:

a.add(new LongNumber(32)) is equal to a.add(32)

You can create chains with methods:

a.add(123).multiply(b).invert() for -((a + 123) * b)