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/** Serializable representation of a ratio. */
export type RatioData = [numerator: number, denominator: number];
/** Representation of a ratio for performing fractional artithmetic. */
export default class Ratio {
private readonly _numerator: number;
private readonly _denominator: number;
get numerator(): number {
return this._numerator;
}
get denominator(): number {
return this._denominator;
}
constructor(numerator: number, denominator: number) {
if (!Number.isInteger(numerator) || !Number.isInteger(denominator)) {
throw new TypeError(
`Ratio must have integer parts: ${numerator} / ${denominator}`,
);
}
if (denominator === 0) {
throw new RangeError("Ratio demnominator cannot be zero");
}
this._numerator = numerator;
this._denominator = denominator;
}
multiplyRatio(other: Ratio): Ratio {
return new Ratio(
this.numerator * other.numerator,
this.denominator * other.denominator,
);
}
divideRatio(other: Ratio): Ratio {
return new Ratio(
this.numerator * other.denominator,
this.denominator * other.numerator,
);
}
toNumber(): number {
return this.numerator / this.denominator;
}
static fromInteger(n: number): Ratio {
return new Ratio(n, 1);
}
toData(): RatioData {
return [this.numerator, this.denominator];
}
static fromData(ratio: RatioData): Ratio {
return new Ratio(ratio[0], ratio[1]);
}
}
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