JavaScript如何检测数组对象answer1字段含Y值并提前终止遍历

你之前使用的Array.prototype.some()方法天然满足「匹配到目标值立即终止遍历」的特性，直接基于该方法实现即可，无需额外编写循环中断逻辑。

实现逻辑 #

• 遍历每个数据项时，首先打印当前项的answer1字段值
• 判断当前项answer1是否为"Y"，命中则返回true，some()方法会立刻终止后续遍历
• 遍历全部结束后，根据some()的返回值输出对应结果日志

完整代码 #

const data = [
  {
    "filename": "deletetestOne.js",
    "answer1": "Y",
    "answer2": "N",
    "riskLevel1": "2",
    "description": ""
  },
  {
    "filename": "deletetestThird.js",
    "answer1": "N",
    "answer2": "N",
    "riskLevel1": "1",
    "description": ""
  }
]

const hasYInAnswer1 = data.some((item) => {
  // 输出当前遍历到的answer1值
  console.log(item.answer1);
  // 命中Y时终止遍历
  return item.answer1 === "Y";
});

console.log(hasYInAnswer1 ? "Found Y in answer1" : "Didn't find Y in answer1");

运行效果说明 #

• 当数据中存在answer1: "Y"的条目时，控制台会先打印命中位置之前所有条目的answer1值，随后输出Found Y in answer1，不会继续遍历后续条目
• 当遍历完所有条目都未找到值为Y的answer1时，控制台会打印所有条目的answer1值，最后输出Didn't find Y in answer1

内容的提问来源于stack exchange，提问作者Tan