Split Timer

SplitTimer.ts

export class SplitTimer {
  private startTime: number;
  private lastTime: number;

  start () {
    this.startTime = Date.now();
    this.lastTime = this.startTime;
  }

  split (message: string) {
    const now = Date.now();
    let output = `${message}: -- [Since Last Split: ${SplitTimer.formatTime(now - this.lastTime)}]`;
    if (this.lastTime !== this.startTime) {
      output += ` [Total Time Elapsed: ${SplitTimer.formatTime(now - this.startTime)}]`;
    }
    console.log(output);
    this.lastTime = now;
  }

  private static formatTime (millis: number): string {
    if (millis < 300) { return `${millis.toFixed(0)}ms`; }

    let seconds = millis / 1000;
    if (seconds < 60) {
      return seconds.toFixed(1);
    }
    const minutes = (seconds / 60).toFixed(0);
    seconds %= 60;
    const secondsStr = ((seconds < 10) ? '0' : '') + seconds.toFixed(1);
    return `${minutes}:${secondsStr}`;
  }
}