head - ts-utility-plugins-docs

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head

说明
 获取指定数组的第一个元素
源码
​https://github.com/ddzy/ts-utility-plugins/tree/master/src/ddzy/utility/array/head​
用法
head.test.ts
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import { head } from "../../utility/array/head";
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​
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describe('head tests: ', () => {
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  test('head should return the first field that was in origin array', () => {
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    const received: number[] = [1, 2, 3, 4, 5];
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    const expected = 1;
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​
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    const result = head<number>(received);
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​
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    expect(result).toBe(expected);
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  });
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​
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  test('head should return undefined when receive an empty array', () => {
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    const received: any[] = [];
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    const expected = undefined;
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​
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    const result = head<any>(received);
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​
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    expect(result).toBe(expected);
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  });
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});
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