Clock

typescript/clock/clock.ts

@@ -0,0 +1,38 @@
+export class Clock {
+  private _hour = 0;
+  private _minute = 0;
+
+  private setTime(hour: number, minute: number = 0): void {
+    this._minute = minute % 60;
+    if (this._minute < 0) {
+      this._minute = 60 + this._minute;
+    }
+
+    this._hour = (hour + Math.floor(minute / 60)) % 24;
+    if (this._hour < 0) {
+      this._hour = (this._hour % 24) + 24;
+    }
+  }
+
+  constructor(hour: number, minute?: number) {
+    this.setTime(hour, minute);
+  }
+
+  public toString(): string {
+    return `${String(this._hour).padStart(2, "0")}:${String(
+      this._minute
+    ).padStart(2, "0")}`;
+  }
+
+  public plus(minutes: number): Clock {
+    return new Clock(this._hour, this._minute + minutes);
+  }
+
+  public minus(minutes: number): Clock {
+    return new Clock(this._hour, this._minute - minutes);
+  }
+
+  public equals(other: Clock): boolean {
+    return this.toString() === other.toString();
+  }
+}