_instanceOf

源码
​https://github.com/ddzy/ts-utility-plugins/tree/master/src/ddzy/utility/others/_instanceOf​
说明
模拟实现instanceOf
用法
_instanceOf.ts
_instanceOf.test.ts
_instanceOf.ts
import { _instanceOf } from "./ddzy/utility/others/_instanceOf";
​
// ? true
const s1 = [{}, Object];
const p1 = _instanceOf((s1[0]), s1[1]);
console.log(p1);
​
// ? true
const s2 = [[], Array];
const p2 = _instanceOf(s2[0], s2[1]);
console.log(p2);
​
// ? true
const s3 = [[], Object];
const p3 = _instanceOf(s3[0], s3[1]);
console.log(p3);
​
// ? false
const s4 = [2, 8];
const p4 = _instanceOf(s4[0], s4[1]);
console.log(p4);
​
// ? false
const s5 = ['ddzy', {}];
const p5 = _instanceOf(s5[0], s5[1]);
console.log(p5);
​
// ? false
const s6 = [{}, null];
const p6 = _instanceOf(s6[0], s6[1]);
console.log(p6);
​
// ? true
interface PersonConstructor {
  new (): PersonInterface;
};
interface PersonInterface {
};
​
class Person implements PersonInterface {
  constructor() {
  }
}
const s7 = [new Person(), Person];
const p7 = _instanceOf(s7[0], s7[1]);
console.log(p7);
_instanceOf.test.ts
import { _instanceOf } from "../../utility/others/_instanceOf";
​
describe('_instanceOf tests...', () => {
​
  test('_instanceOf should return the correct result', () => {
    interface PersonConstructor {
      new(): PersonInterface;
    };
    interface PersonInterface {
    };
​
    class Person implements PersonInterface {
      constructor() {
      }
    }
​
    const received: Array<{
      left: any,
      right: any,
    }> = [
        {
          left: new Person(),
          right: Person,
        },
        {
          left: {},
          right: Object,
        },
        {
          left: [],
          right: Array,
        },
        {
          left: [],
          right: Object,
        },
        {
          left: 2,
          right: 8,
        },
        {
          left: 'ddzy',
          right: {},
        },
        {
          left: {},
          right: null,
        },
      ];
    const expected = [true, true, true, true, false, false, false,];
​
    received.forEach((v, i) => {
      const result = _instanceOf(v.left, v.right);
​
      expect(result).toBe(expected[i]);
    });
  });
​
});
size
Last updated 4 months ago