Javascript从数组匹配和查找

function linearSearch(arr, target) {
  for (let i = 0; i < arr.length; i++) {
    if (arr[i] === target) {
      return i;
    }
  }
  return -1;
}

const array = [2, 4, 6, 8, 10];
const target = 6;
console.log(linearSearch(array, target)); // 输出: 2

function binarySearch(arr, target) {
  let left = 0;
  let right = arr.length - 1;

  while (left <= right) {
    const mid = Math.floor((left + right) / 2);

    if (arr[mid] === target) {
      return mid;
    }

    if (arr[mid] < target) {
      left = mid + 1;
    } else {
      right = mid - 1;
    }
  }

  return -1;
}

const array = [2, 4, 6, 8, 10];
const target = 6;
console.log(binarySearch(array, target)); // 输出: 2

const array = [2, 4, 6, 8, 10];
const target = 6;
console.log(array.indexOf(target)); // 输出: 2

const array = [2, 4, 6, 8, 10];
const target = 6;
console.log(array.includes(target)); // 输出: true

const array = [2, 4, 6, 8, 10];
const target = 6;
console.log(array.find((element) => element === target)); // 输出: 6

const array = [2, 4, 6, 8, 10];
const target = 6;
console.log(array.filter((element) => element === target)); // 输出: [6]