基于键映射计算足球比赛事件发生平均间隔分钟数

原始数据 #

const gameEvents = new Map([
  [17, '⚽ GOAL'],
  [36, '🔁 Substitution'],
  [47, '⚽ GOAL'],
  [61, '🔁 Substitution'],
  [64, '🟡 Yellow card'],
  [69, '🔴 Red card'],
  [70, '🔁 Substitution'],
  [72, '🔁 Substitution'],
  [76, '⚽ GOAL'],
  [80, '⚽ GOAL'],
  [92, '🟡 Yellow card'],
]);

实现步骤与代码 #

1. 提取事件分钟数
   通过扩展运算符将Map的键（事件发生分钟）转换为数组，方便后续计算：

   const eventMinutes = [...gameEvents.keys()];
   

2. 计算平均间隔
   以比赛开始到最后一个事件的总时长除以事件总数，得到平均间隔并取整：

   const totalDuration = eventMinutes[eventMinutes.length - 1];
   const averageInterval = Math.round(totalDuration / eventMinutes.length);
   

3. 输出指定格式结果
   使用模板字符串输出要求的内容：

   console.log(`an event happened on average every ${averageInterval} minutes`);
   

完整代码 #

const gameEvents = new Map([
  [17, '⚽ GOAL'],
  [36, '🔁 Substitution'],
  [47, '⚽ GOAL'],
  [61, '🔁 Substitution'],
  [64, '🟡 Yellow card'],
  [69, '🔴 Red card'],
  [70, '🔁 Substitution'],
  [72, '🔁 Substitution'],
  [76, '⚽ GOAL'],
  [80, '⚽ GOAL'],
  [92, '🟡 Yellow card'],
]);

const eventMinutes = [...gameEvents.keys()];
const totalDuration = eventMinutes[eventMinutes.length - 1];
const averageInterval = Math.round(totalDuration / eventMinutes.length);

console.log(`an event happened on average every ${averageInterval} minutes`);

补充说明 #

如果需要计算相邻事件之间的平均间隔，可替换计算逻辑为：

let totalGap = 0;
for (let i = 1; i < eventMinutes.length; i++) {
  totalGap += eventMinutes[i] - eventMinutes[i - 1];
}
const averageInterval = Math.round(totalGap / (eventMinutes.length - 1));

内容的提问来源于stack exchange，提问作者Juanman