A pure javascript big fixed point number library base on BigInt.
npm install bigfixed
BigFixed range: ( -Inf, -(2**(-64)) ] & 0 & [ 2**(-64), +Inf )
BigFixed struct: signed BigInt <N bits integer part . 64 bits fraction part>
NOTE: this lib is calculate by binary but not decimal number
BigFixed(0.1).add(0.2).toString() === "0.30000000000000004"
Compare of big number lib
test number: 3838.261003615915,
test count: 100000
Execution time in nano seconds(1e-9s):
Operate BigFixed BigNumber Big Decimal
new 580 750 410 690
add 90 210 240 270
sub 120 300 490 500
mul 210 420 1220 710
div 800 3760 6720 3360
pow 380 1360 3950 2330
str 530 220 410 250
- BigFixed own prototype names
[
'constructor', 'clone', 'isZero',
'isNegative', 'isInteger', 'eq',
'lt', 'lte', 'gt',
'gte', 'neg', 'abs',
'add', 'sub', 'mul',
'div', 'mod', 'pow',
'not', 'and', 'or',
'xor', 'lShift', 'rShift',
'toInteger', 'toNumber', 'toJSON',
'toString'
]- Create
const BigFixed = require('bigfixed');
console.log(BigFixed(-3.14));
// BigFixed { fixed: -57922776391447994368n }
console.log(new BigFixed(-3.14));
// BigFixed { fixed: -57922776391447994368n }
console.log(BigFixed(-3.14).toString());
// -3.14000000000000012
console.log(BigFixed(-3.14).toNumber());
// -3.14
console.log(BigFixed(-3.14).toString(2));
// -11.001000111101011100001010001111010111000010100011111
console.log(BigFixed(-3.14).toString(8));
// -3.10753412172702437
console.log(BigFixed(-3.14).toString(16));
// -3.23d70a3d70a3e
console.log(BigFixed(' -3.14 ').toString());
// -3.14
console.log(BigFixed('0b0111').toString());
// 7
console.log(BigFixed('0xff').toString());
// 255
console.log(BigFixed(true).toString());
// 1
console.log(BigFixed(false).toString());
// 0- Arithmetic
console.log(BigFixed(125.25).add(100).toString());
// 225.25
console.log(BigFixed(Number.MAX_SAFE_INTEGER).add(Number.MAX_SAFE_INTEGER).toString());
// 18014398509481982
console.log(BigFixed(125.25).sub(0.125).toString());
// 125.125
console.log(BigFixed(Number.MAX_SAFE_INTEGER).sub(Number.MAX_SAFE_INTEGER).toString());
// 0
console.log(BigFixed(125.25).mul(100).toString());
// 12525
console.log(BigFixed(Number.MAX_SAFE_INTEGER).mul(Number.MAX_SAFE_INTEGER).toString());
// 81129638414606663681390495662081
console.log(BigFixed(125.25).div(8).toString());
// 15.65625
console.log(BigFixed(2).div(3).toString());
// 0.6666666666666666
console.log(BigFixed(8).mod(3).toString());
// 2
console.log(BigFixed(0.8).mod(0.3).toString());
// 0.20000000000000007
console.log(BigFixed(5).pow(2).toString());
// 25
console.log(BigFixed(3.14).pow(100).toString());
// 49313384166056347098523752010452971971940876154701.02980356808155629- Logical
console.log('Logical');
console.log(BigFixed(0x0f).not().toString(16));
// -f.0000000000000001
console.log(BigFixed(0x0f).not().not().toString(16));
// f
console.log(BigFixed(0x0f).and(0xf0).toString(16));
// 0
console.log(BigFixed(0x0f).or(0xf0).toString(16));
// ff
console.log(BigFixed(0x0f).xor(0xf0).toString(16));
// ff
console.log(BigFixed(0x0f).lShift(1).toString(16));
// 1e
console.log(BigFixed(0x0f).rShift(1).toString(16));
// 7.8- To integer
same as Math.round, Math.ceil, Math.floor, default BigFixed.ROUND
console.log(BigFixed(3.51).toInteger(BigFixed.CEIL).toString());
// 4
console.log(BigFixed(3.51).toInteger().toString());
// 4
console.log(BigFixed(3.51).toInteger(BigFixed.FLOOR).toString());
// 3
console.log(BigFixed(3.49).toInteger(BigFixed.CEIL).toString());
// 4
console.log(BigFixed(3.49).toInteger().toString());
// 3
console.log(BigFixed(3.49).toInteger(BigFixed.FLOOR).toString());
// 3jest