take - ts-utility-plugins-docs

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take

说明
创建一个数组切片，从 arr 数组的起始元素开始提取 amount 个元素
源码
​https://github.com/ddzy/ts-utility-plugins/tree/master/src/ddzy/utility/array/take​
用法
take.test.ts
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import take from "../../utility/array/take";
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​
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describe('take', () => {
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  test('Method `take()` should return the correct result', () => {
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    const received = [
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      {
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        arr: [1, 2, 3, 4, 5, 6, 7, 8],
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        amount: 5,
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      },
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      {
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        arr: [],
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        amount: 3,
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      },
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      {
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        arr: ['a', 'b', 'c', 'd', 'e'],
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        amount: 8,
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      },
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      {
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        arr: [[], [], [], [1, 2, 3]],
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        amount: 0,
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      },
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    ];
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    const expected = [
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      [1, 2, 3, 4, 5],
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      [],
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      ['a', 'b', 'c', 'd', 'e'],
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      [],
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    ];
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​
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    received.forEach((outerV, outerI) => {
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      const result = take<any>(outerV.arr, outerV.amount);
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​
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      if (result.length > 0) {
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        result.forEach((innerV, innerI) => {
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          expect(innerV).toBe(expected[outerI][innerI]);
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        });
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      } else {
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        if (outerI % 2 !== 0) {
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          expect(result.length).toBe(expected[outerI].length);
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        }
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      }
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    });
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  });
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});
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