Bigdecimal js
Příklady kódu
velký.js
const Big = require('big.js');
var val = new Big(0.0);
var amount = new Big(2.55);
var sum = val.plus(amount).times(100000);
console.log(sum.toFixed(2));
javascript bigdecimal
class BigDecimal {
// Configuration: constants
static DECIMALS = 18; // number of decimals on all instances
static ROUNDED = true; // numbers are truncated (false) or rounded (true)
static SHIFT = BigInt("1" + "0".repeat(BigDecimal.DECIMALS)); // derived constant
constructor(value) {
if (value instanceof BigDecimal) return value;
let [ints, decis] = String(value).split(".").concat("");
this._n = BigInt(ints + decis.padEnd(BigDecimal.DECIMALS, "0")
.slice(0, BigDecimal.DECIMALS))
+ BigInt(BigDecimal.ROUNDED && decis[BigDecimal.DECIMALS] >= "5");
}
static fromBigInt(bigint) {
return Object.assign(Object.create(BigDecimal.prototype), { _n: bigint });
}
add(num) {
return BigDecimal.fromBigInt(this._n + new BigDecimal(num)._n);
}
subtract(num) {
return BigDecimal.fromBigInt(this._n - new BigDecimal(num)._n);
}
static _divRound(dividend, divisor) {
return BigDecimal.fromBigInt(dividend / divisor
+ (BigDecimal.ROUNDED ? dividend * 2n / divisor % 2n : 0n));
}
multiply(num) {
return BigDecimal._divRound(this._n * new BigDecimal(num)._n, BigDecimal.SHIFT);
}
divide(num) {
return BigDecimal._divRound(this._n * BigDecimal.SHIFT, new BigDecimal(num)._n);
}
toString() {
const s = this._n.toString().padStart(BigDecimal.DECIMALS+1, "0");
return s.slice(0, -BigDecimal.DECIMALS) + "." + s.slice(-BigDecimal.DECIMALS)
.replace(/\.?0+$/, "");
}
}
// Demo
var a = new BigDecimal("123456789123456789876");
var b = a.divide("10000000000000000000");
var c = b.add("9.000000000000000004");
console.log(b.toString());
console.log(c.toString());
console.log(+c); // loss of precision when converting to numberSouvisející stránky
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