var arr = [3,6,9,12];
if(arr.some(function checknumber(number){return number == 12;})) {
    //代碼塊
}
//因為arr數(shù)組中有12的值，所以代碼塊會執(zhí)行，而函數(shù)checknumber中傳的參數(shù)number是從數(shù)組arr中讀取

arr.some(callback(element[, index[, array]])[, thisArg])

const arr = [1, 3, 5, 8, 9];
const hasEven = arr.some(num => {
  console.log(num); // 輸出：1, 3, 5, 8（找到 8 后停止）
  return num % 2 === 0;
});
console.log(hasEven); // true

[].some(() => true); // false

const numbers = [1, 3, 5, 7, 8];
const hasEven = numbers.some(num => num % 2 === 0);
console.log(hasEven); // true

const users = [
  { id: 1, name: "Alice", isLoggedIn: true },
  { id: 2, name: "Bob", isLoggedIn: false },
  { id: 3, name: "Charlie", isLoggedIn: true },
];
const hasLoggedOut = users.some(user => !user.isLoggedIn);
console.log(hasLoggedOut); // true

const whiteList = ["/login", "/register", "/public"];
const isAllowed = (path) => {
  return whiteList.some(pattern => path.startsWith(pattern));
};
console.log(isAllowed("/login")); // true
console.log(isAllowed("/admin")); // false

const formFields = [
  { name: "username", value: "", error: "用戶名不能為空" },
  { name: "password", value: "123", error: "" },
  { name: "email", value: "test@", error: "郵箱格式錯誤" },
];
const hasError = formFields.some(field => field.error !== "");
console.log(hasError); // true

// ? 錯誤示例：在回調(diào)中修改外部變量
let count = 0;
const arr = [1, 2, 3];
arr.some(num => {
  count++; // 副作用！
  return num > 2;
});

const arr = [1, , 3];
arr.some(num => num === undefined); // false（空位不觸發(fā)回調(diào)）

const bigArray = new Array(1000000).fill(0);
bigArray[999999] = 1;
// ? 快速找到非零元素
const hasNonZero = bigArray.some(num => num !== 0); // 僅遍歷到最后一個元素