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@chul-hyun
Created September 20, 2018 09:03
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Chapter3
class Gear {
private _wheel: Wheel;
constructor(
readonly chainring: number,
readonly cog: number,
readonly rim: number,
readonly tire: number
) {}
get ratio() {
return this.chainring / this.cog;
}
get gearInches() {
return this.ratio * this.diameter;
}
private get wheel() {
if (this._wheel === undefined) {
this._wheel = new Wheel(this.rim, this.tire);
}
return this._wheel;
}
private get diameter() {
return this.wheel.diameter
}
}
class Wheel {
constructor(readonly rim: number, readonly tire: number) {}
get diameter() {
return this.rim * (this.tire * 2);
}
}
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