# compact

### 说明

 过滤指定数组中的假值(`0`、`''`、`false`、`null`、`undefined`、`NaN`)

### 源码

<https://github.com/ddzy/ts-utility-plugins/tree/master/src/ddzy/utility/array/compact>

### 用法

{% code title="compact.test.ts" %}

```typescript
import { compact } from "../../utility/array/compact";

describe('compact', () => {
  test('compact should return an empty array when receive an empty array', () => {
    const received: any[] = [];
    const expected = 0;

    const result = compact<any>(received);

    expect(result.length).toBe(0);
  });

  test('compact should return the array only contains truthy value', () => {
    const received: any[] = [true, false, 0, '', undefined, NaN, null, 22];
    const expected = [true, 22];

    const result = compact<any>(received);

    for (const [i, v] of result.entries()) {
      expect(v).toBe(expected[i]);
    }
  });

  test('compact should return a new array', () => {
    const received: number[] = [0, 1, 2, 3, 4];
    const expected: number[] = [1, 2, 3, 4];

    const result = compact<number>(received);

    received.push(5);

    for (const [i, v] of result.entries()) {
      expect(v).toBe(expected[i]);
    }
  });
})
```

{% endcode %}


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