캡슐화. 은닉성, getter setter를 쓰는것을 지양해야 하는 이유

version1.ts

class ProceduralStopWatch {
    public startTime;
    public stopTime;
    
    getElapsedTime = () => this.startMsTime - this.stopMsTime
}

// example

const stopWatch = new ProceduralStopWatch();
stopWatch.startTime = Date.now();

somthing();

stopWatch.stopTime = Date.now();
const elapsedTime = stopWatch.getElapsedTime();

console.log(`result: ${elapsedTime}`);

version2.ts

class ProceduralStopWatch {
    public startTime;
    public stopTime;

    public startNanoTime;
    public stopNanoTime;
    
    getElapsedTime = () => this.startMsTime - this.stopMsTime
    getElapsedNanoTime = () => this.startNanoTime - this.stopNanoTime
}

// example

const stopWatch = new ProceduralStopWatch();
stopWatch.startNanoTime = performance.now();

somthing();

stopWatch.stopNanoTime = performance.now();
const elapsedNanoTime = stopWatch.getElapsedNanoTime();

console.log(`result: ${elapsedNanoTime}`);