1. // 高阶函数 模拟 map every some
    2. // map
    3. const myMap = (array, fn) => {
    4.   const results = [];
    5.   for (let value of array) {
    6.     results.push(fn(value));
    7.   }
    8.   return results;
    9. };
    11. const arr = [1, 2, 35, 63, 6];
    12. const mapRes = myMap(arr, item => `我是平方:${item * item}`);
    13. console.log("mapRes", mapRes);
    15. // every
    16. const myEvery = (array, fn) => {
    17.   let flag = true;
    18.   for (let value of array) {
    19.     if (!fn(value)) {
    20.       flag = false;
    21.       break;
    22.     }
    23.   }
    24.   return flag;
    25. };
    27. const everyRes = myEvery(arr, item => item > 10);
    28. console.log("everyRes", everyRes);
    30. // some
    31. const mySome = (array, fn) => {
    32.   let flag = false;
    33.   for (let i = 0; i < array.length; i++) {
    34.     if (fn(array[i])) {
    35.       flag = true;
    36.       break;
    37.     }
    38.   }
    39.   return flag;
    40. };
    42. const someRes = mySome(arr, item => item % 2 === 0);
    43. console.log("someRes", someRes);