dropRightWhile

源码
​https://github.com/ddzy/ts-utility-plugins/tree/master/src/ddzy/utility/array/dropRightWhile​
说明
创建一个切片数组, 去除源数组中从特定的 callback 返回假值开始到尾部的部分
用法
dropRightWhile.ts
dropRightWhile.test.ts
import { dropRightWhile } from "./ddzy/utility/array/dropRightWhile";
​
// ? 空数组
const s1: number[] = [];
const p1 = dropRightWhile<number>(s1, function (v) {
  return !!v;
});
console.log(p1);
​
// ? 普通数字数组
const s2: number[] = [23, 34, -1, -5, 54, 22, 0];
const p2 = dropRightWhile<number>(s2, function (v) {
  return v < 0;
});
console.log(p2);
​
// ? 普通键值对对象数组
interface IS3Params {
  name: string;
  age: number;
};
const s3: IS3Params[] = [
  { name: 'duan', age: 20 },
  { name: 'zhao', age: 30 },
  { name: 'yang', age: 40 },
];
const p3 = dropRightWhile<IS3Params>(s3, function (v) {
  return v.age === 30;
});
console.log(p3);
import { dropRightWhile } from "../../utility/array/dropRightWhile";
​
describe('dropRightWhile tests...', () => {
​
  test('dropRightWhile should return an empty array when receve an empty array', () => {
    const received: number[] = [];
    const expected = 0;
​
    const result = dropRightWhile<number>(received, function (v) {
      return !!v;
    });
​
    expect(result.length).toBe(expected);
  });
​
  test('dropRightWhile should return the filtered array when receive an array being composed of number', () => {
    const received: number[] = [23, 34, -1, -5, 54, 22, 0];
    const expected: number[] = [23, 34];
​
    const result = dropRightWhile(received, function (v) {
      return v < 0;
    })
​
    for (const [i, v] of result.entries()) {
      expect(v).toBe(expected[i]);
    }
  });
​
  test('dropRightWhile should return the filtered array when receive an array being composed of object', () => {
    interface IReceivedParams {
      name: string;
      age: number;
    };
    const received: IReceivedParams[] = [
      { name: 'duan', age: 20 },
      { name: 'zhao', age: 30 },
      { name: 'yang', age: 40 },
    ];
    const expected = [received[0]];
​
​
    const result = dropRightWhile<IReceivedParams>(received, function (v) {
      return v.age === 30;
    });
​
    for (const [i, v] of result.entries()) {
      expect(v).toBe(expected[i]);
    }
  });
​
});
dropRight
fill
Last updated 2 months ago