Utility
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源码
用法
dropRightWhile.test.ts
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import { dropRightWhile } from "../../utility/array/dropRightWhile";
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describe('dropRightWhile tests...', () => {
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test('dropRightWhile should return an empty array when receve an empty array', () => {
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const received: number[] = [];
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const expected = 0;
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const result = dropRightWhile<number>(received, function (v) {
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return !!v;
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});
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expect(result.length).toBe(expected);
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});
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test('dropRightWhile should return the filtered array when receive an array being composed of number', () => {
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const received: number[] = [23, 34, -1, -5, 54, 22, 0];
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const expected: number[] = [23, 34];
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const result = dropRightWhile(received, function (v) {
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return v < 0;
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})
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for (const [i, v] of result.entries()) {
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expect(v).toBe(expected[i]);
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}
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});
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test('dropRightWhile should return the filtered array when receive an array being composed of object', () => {
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interface IReceivedParams {
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name: string;
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age: number;
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};
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const received: IReceivedParams[] = [
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{ name: 'duan', age: 20 },
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{ name: 'zhao', age: 30 },
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{ name: 'yang', age: 40 },
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];
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const expected = [received[0]];
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const result = dropRightWhile<IReceivedParams>(received, function (v) {
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return v.age === 30;
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});
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for (const [i, v] of result.entries()) {
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expect(v).toBe(expected[i]);
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}
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});
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});
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