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lancevo/bignumber.js

Created November 26, 2013 20:35
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bignumber.js
//+ Jonas Raoni Soares Silva
//@ http://jsfromhell.com/classes/bignumber [rev. #4]
BigNumber = function(n, p, r){
var o = this, i;
if(n instanceof BigNumber){
for(i in {precision: 0, roundType: 0, _s: 0, _f: 0}) o[i] = n[i];
o._d = n._d.slice();
return;
}
o.precision = isNaN(p = Math.abs(p)) ? BigNumber.defaultPrecision : p;
o.roundType = isNaN(r = Math.abs(r)) ? BigNumber.defaultRoundType : r;
o._s = (n += "").charAt(0) == "-";
o._f = ((n = n.replace(/[^\d.]/g, "").split(".", 2))[0] = n[0].replace(/^0+/, "") || "0").length;
for(i = (n = o._d = (n.join("") || "0").split("")).length; i; n[--i] = +n[i]);
o.round();
};
with({$: BigNumber, o: BigNumber.prototype}){
$.ROUND_HALF_EVEN = ($.ROUND_HALF_DOWN = ($.ROUND_HALF_UP = ($.ROUND_FLOOR = ($.ROUND_CEIL = ($.ROUND_DOWN = ($.ROUND_UP = 0) + 1) + 1) + 1) + 1) + 1) + 1;
$.defaultPrecision = 40;
$.defaultRoundType = $.ROUND_HALF_UP;
o.add = function(n){
if(this._s != (n = new BigNumber(n))._s)
return n._s ^= 1, this.subtract(n);
var o = new BigNumber(this), a = o._d, b = n._d, la = o._f,
lb = n._f, n = Math.max(la, lb), i, r;
la != lb && ((lb = la - lb) > 0 ? o._zeroes(b, lb, 1) : o._zeroes(a, -lb, 1));
i = (la = a.length) == (lb = b.length) ? a.length : ((lb = la - lb) > 0 ? o._zeroes(b, lb) : o._zeroes(a, -lb)).length;
for(r = 0; i; r = (a[--i] = a[i] + b[i] + r) / 10 >>> 0, a[i] %= 10);
return r && ++n && a.unshift(r), o._f = n, o.round();
};
o.subtract = function(n){
if(this._s != (n = new BigNumber(n))._s)
return n._s ^= 1, this.add(n);
var o = new BigNumber(this), c = o.abs().compare(n.abs()) + 1, a = c ? o : n, b = c ? n : o, la = a._f, lb = b._f, d = la, i, j;
a = a._d, b = b._d, la != lb && ((lb = la - lb) > 0 ? o._zeroes(b, lb, 1) : o._zeroes(a, -lb, 1));
for(i = (la = a.length) == (lb = b.length) ? a.length : ((lb = la - lb) > 0 ? o._zeroes(b, lb) : o._zeroes(a, -lb)).length; i;){
if(a[--i] < b[i]){
for(j = i; j && !a[--j]; a[j] = 9);
--a[j], a[i] += 10;
}
b[i] = a[i] - b[i];
}
return c || (o._s ^= 1), o._f = d, o._d = b, o.round();
};
o.multiply = function(n){
var o = new BigNumber(this), r = o._d.length >= (n = new BigNumber(n))._d.length, a = (r ? o : n)._d,
b = (r ? n : o)._d, la = a.length, lb = b.length, x = new BigNumber, i, j, s;
for(i = lb; i; r && s.unshift(r), x.set(x.add(new BigNumber(s.join("")))))
for(s = (new Array(lb - --i)).join("0").split(""), r = 0, j = la; j; r += a[--j] * b[i], s.unshift(r % 10), r = (r / 10) >>> 0);
return o._s = o._s != n._s, o._f = ((r = la + lb - o._f - n._f) >= (j = (o._d = x._d).length) ? this._zeroes(o._d, r - j + 1, 1).length : j) - r, o.round();
};
o.divide = function(n){
if((n = new BigNumber(n)) == "0")
throw new Error("Division by 0");
else if(this == "0")
return new BigNumber;
var o = new BigNumber(this), a = o._d, b = n._d, la = a.length - o._f,
lb = b.length - n._f, r = new BigNumber, i = 0, j, s, l, f = 1, c = 0, e = 0;
r._s = o._s != n._s, r.precision = Math.max(o.precision, n.precision),
r._f = +r._d.pop(), la != lb && o._zeroes(la > lb ? b : a, Math.abs(la - lb));
n._f = b.length, b = n, b._s = false, b = b.round();
for(n = new BigNumber; a[0] == "0"; a.shift());
out:
do{
for(l = c = 0, n == "0" && (n._d = [], n._f = 0); i < a.length && n.compare(b) == -1; ++i){
(l = i + 1 == a.length, (!f && ++c > 1 || (e = l && n == "0" && a[i] == "0")))
&& (r._f == r._d.length && ++r._f, r._d.push(0));
(a[i] == "0" && n == "0") || (n._d.push(a[i]), ++n._f);
if(e)
break out;
if((l && n.compare(b) == -1 && (r._f == r._d.length && ++r._f, 1)) || (l = 0))
while(r._d.push(0), n._d.push(0), ++n._f, n.compare(b) == -1);
}
if(f = 0, n.compare(b) == -1 && !(l = 0))
while(l ? r._d.push(0) : l = 1, n._d.push(0), ++n._f, n.compare(b) == -1);
for(s = new BigNumber, j = 0; n.compare(y = s.add(b)) + 1 && ++j; s.set(y));
n.set(n.subtract(s)), !l && r._f == r._d.length && ++r._f, r._d.push(j);
}
while((i < a.length || n != "0") && (r._d.length - r._f) <= r.precision);
return r.round();
};
o.mod = function(n){
return this.subtract(this.divide(n).intPart().multiply(n));
};
o.pow = function(n){
var o = new BigNumber(this), i;
if((n = (new BigNumber(n)).intPart()) == 0) return o.set(1);
for(i = Math.abs(n); --i; o.set(o.multiply(this)));
return n < 0 ? o.set((new BigNumber(1)).divide(o)) : o;
};
o.set = function(n){
return this.constructor(n), this;
};
o.compare = function(n){
var a = this, la = this._f, b = new BigNumber(n), lb = b._f, r = [-1, 1], i, l;
if(a._s != b._s)
return a._s ? -1 : 1;
if(la != lb)
return r[(la > lb) ^ a._s];
for(la = (a = a._d).length, lb = (b = b._d).length, i = -1, l = Math.min(la, lb); ++i < l;)
if(a[i] != b[i])
return r[(a[i] > b[i]) ^ a._s];
return la != lb ? r[(la > lb) ^ a._s] : 0;
};
o.negate = function(){
var n = new BigNumber(this); return n._s ^= 1, n;
};
o.abs = function(){
var n = new BigNumber(this); return n._s = 0, n;
};
o.intPart = function(){
return new BigNumber((this._s ? "-" : "") + (this._d.slice(0, this._f).join("") || "0"));
};
o.valueOf = o.toString = function(){
var o = this;
return (o._s ? "-" : "") + (o._d.slice(0, o._f).join("") || "0") + (o._f != o._d.length ? "." + o._d.slice(o._f).join("") : "");
};
o._zeroes = function(n, l, t){
var s = ["push", "unshift"][t || 0];
for(++l; --l; n[s](0));
return n;
};
o.round = function(){
if("_rounding" in this) return this;
var $ = BigNumber, r = this.roundType, b = this._d, d, p, n, x;
for(this._rounding = true; this._f > 1 && !b[0]; --this._f, b.shift());
for(d = this._f, p = this.precision + d, n = b[p]; b.length > d && !b[b.length -1]; b.pop());
x = (this._s ? "-" : "") + (p - d ? "0." + this._zeroes([], p - d - 1).join("") : "") + 1;
if(b.length > p){
n && (r == $.DOWN ? false : r == $.UP ? true : r == $.CEIL ? !this._s
: r == $.FLOOR ? this._s : r == $.HALF_UP ? n >= 5 : r == $.HALF_DOWN ? n > 5
: r == $.HALF_EVEN ? n >= 5 && b[p - 1] & 1 : false) && this.add(x);
b.splice(p, b.length - p);
}
return delete this._rounding, this;
};
}
Raw
example.html
<script type="text/javascript">
//<![CDATA[
var a = new BigNumber("123456789012345678901234567890123456789"),
b = "999999999999999999999999999.9999999999999999999999",
c = new BigNumber("10"),
d = new BigNumber("-2"),
PI = new BigNumber(355, 100, BigNumber.ROUND_HALF_UP).divide(113);
document.write(
"<strong>10 ^ -2 = </strong>" + c.pow(d) + "<br />",
"<strong>PI constant (using precision = 100, mode = ROUND_HALF_UP) = </strong>" + PI + "<br />",
"<strong>" + a + " * " + b + " = </strong>" + a.multiply(b)
);
//]]>
</script>
Raw
help.txt
Constructor
BigNumber([number: Object = 0], [precision: Integer = BigNumber.defaultPrecision], [roundType: Integer = BigNumber.defaultRoundType])
Generates a new instance of BigNumber.
number accepts string, number or BigNumber
precision precision
roundType rounding type
Rounding types
BigNumber.ROUND_HALF_EVEN Rounds 5-9 to the nearest even number.
BigNumber.ROUND_HALF_DOWN Rounds 0-5 to down.
BigNumber.ROUND_HALF_UP Rounds 5-9 to up.
BigNumber.ROUND_FLOOR Rounds towards to the lower (considerating the signal).
BigNumber.ROUND_CEIL Rounds towards to the higher (considerating the signal).
BigNumber.ROUND_DOWN Rounds towards to the the lower.
BigNumber.ROUND_UP Rounds towards to the higher.
Class properties
BigNumber.defaultPrecision: Integer = 40 Precision that will be used by default.
BigNumber.defaultRoundType: Integer = BigNumber.ROUND_HALF_UP Default rounding type.
Properties
BigNumber.precision: Integer Specifies the max precision (amount of numbers after the floating point).
BigNumber.roundType: Integer Indicates the rounding type that will be used when the number is higher than the precision
Methods
All the methods (except "set" and "round") that returns BigNumber, will return a new instance instead of the own object used in the calling.
BigNumber.set(n: Object): BigNumber
Sets the value of the object with the specified number.
n accepts string, number or a BigNumber
BigNumber.add(n: Object): BigNumber
Does the sum.
n accepts string, number or a BigNumber
BigNumber.subtract(n: Object): BigNumber
Does the subtration.
n accepts string, number or a BigNumber
BigNumber.multiply(n: Object): BigNumber
Does the multiplication.
n accepts string, number or a BigNumber
BigNumber.divide(n: Object): BigNumber
Does the division.
n accepts string, number or a BigNumber
BigNumber.mod(n: Object): BigNumber
Does the division and returns the remainder.
n accepts string, number or a BigNumber
BigNumber.pow(n: Object): BigNumber
Does the power.
n accepts string, number or a BigNumber
BigNumber.compare(n: Object): BigNumber
Compares the numbers and returns -1 if "n" is higher, 0 if they are equal and 1 if "n" is lower.
n accepts string, number or a BigNumber
BigNumber.negate(n: Object): BigNumber
Returns "-number".
n accepts string, number or a BigNumber
BigNumber.abs(n: Object): BigNumber
Returns the modulus of the number.
n accepts string, number or a BigNumber
BigNumber.intPart(n: Object): BigNumber
Returs the integer part of the number.
n accepts string, number or a BigNumber
BigNumber.round(void): void
Forces the rounding of the number.
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