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--- | ||
'@modern-kit/utils': minor | ||
--- | ||
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feat(utils): contain 신규 유틸 함수 추가 - @ssi02014 |
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# contain | ||
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첫 번째 인자로 넘긴 배열에 특정 요소가 포함되어 있는지 판단하는 유틸 함수입니다. | ||
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includes의 `as const`를 활용 했을 때, 타입이 호환되지 않은 요소가 포함되어 있는지 확인 할 때 타입 에러가 발생하는 문제점을 `some` 메서드를 활용해 개선하기 위한 함수입니다. | ||
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```ts title="typescript" | ||
const arr = [1, 2, 3] as const | ||
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arr.includes(4); // '4' 형식의 인수는 '1 | 2 | 3' 형식의 매개 변수에 할당될 수 없습니다. | ||
``` | ||
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`some` 메서드를 통해 요소가 포함되어 있는지 판단 할 때 기본적으로 `Object.is` 메서드를 활용합니다. 단, 필요 시에 3번째 인자로 `comparator` 함수를 활용 할 수 있습니다. | ||
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## Code | ||
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[🔗 실제 구현 코드 확인](https://github.com/modern-agile-team/modern-kit/blob/main/packages/utils/src/array/contain/index.ts) | ||
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## Interface | ||
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```ts title="typescript" | ||
const contain: <T>( | ||
arr: readonly T[] | T[], | ||
value: unknown, | ||
comparator?: (x: any, y: any) => boolean // default: Object.is | ||
) => value is T; | ||
``` | ||
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## Usage | ||
### Default | ||
```ts title="typescript" | ||
import { contain } from '@modern-kit/utils'; | ||
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const arr = [0, 1, 2, 3, NaN, {}]; | ||
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contain(arr, 1); // true | ||
contain(arr, NaN); // true | ||
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contain(arr, -0); // false | ||
contain(arr, 4); // false | ||
contain(arr, "3"); // false | ||
contain(arr, {}); // false | ||
``` | ||
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### Comparator | ||
```ts title="typescript" | ||
const arr = [{ a: 1, b: 2 }]; | ||
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contain(arr, { a: 1, c: 2 }, (x, y) => x.a === y.a); // true | ||
contain( | ||
arr, | ||
{ a: 1, b: 2 }, | ||
(x, y) => JSON.stringify(x) === JSON.stringify(y) | ||
); // true | ||
``` | ||
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### Narrowing types | ||
```ts title="typescript" | ||
const arr = [2, 3, 'foo'] as const; | ||
const value = 'foo' as unknown; | ||
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if (contain(arr, value)) { | ||
value; // 2 | 3 | 'foo' | ||
} else { | ||
value; // unknown | ||
} | ||
``` | ||
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## Note | ||
- [Object.is(en) - MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is) | ||
- [Object.is(ko) - MDN](https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Object/is) | ||
- [동등 비교 및 동일성(en) - MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Equality_comparisons_and_sameness) | ||
- [동등 비교 및 동일성(ko) - MDN](https://developer.mozilla.org/ko/docs/Web/JavaScript/Equality_comparisons_and_sameness#%EB%8F%99%EC%9D%BC_%EA%B0%92_%EC%A0%9C%EB%A1%9C_%EB%8F%99%EB%93%B1) |
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import { contain } from '.'; | ||
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describe('contain', () => { | ||
it('should return true if the array contains the element, otherwise return false.', () => { | ||
const arr = [0, 1, 2, 'foo', NaN, {}]; | ||
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expect(contain(arr, 1)).toBeTruthy(); | ||
expect(contain(arr, 'foo')).toBeTruthy(); | ||
expect(contain(arr, NaN)).toBeTruthy(); | ||
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expect(contain(arr, 4)).toBeFalsy(); | ||
expect(contain(arr, {})).toBeFalsy(); | ||
expect(contain(arr, -0)).toBeFalsy(); | ||
expect(contain(arr, '2')).toBeFalsy(); | ||
}); | ||
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it('should determine inclusion based on the result of the comparator function if provided.', () => { | ||
const arr = [{ a: 1, b: 2 }]; | ||
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expect(contain(arr, { a: 1, c: 2 }, (x, y) => x.a === y.a)).toBeTruthy(); | ||
expect( | ||
contain( | ||
arr, | ||
{ a: 1, b: 2 }, | ||
(x, y) => JSON.stringify(x) === JSON.stringify(y) | ||
) | ||
).toBeTruthy(); | ||
}); | ||
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it('should perform type narrowing with conditional expressions.', () => { | ||
const arr = [2, 3, 'foo'] as const; | ||
const value = 'foo' as unknown; | ||
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if (contain(arr, value)) { | ||
expectTypeOf(value).toEqualTypeOf<2 | 3 | 'foo'>(); | ||
} else { | ||
expectTypeOf(value).toEqualTypeOf<unknown>(); | ||
} | ||
}); | ||
}); |
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export const contain = <T>( | ||
arr: T[] | ReadonlyArray<T>, | ||
value: unknown, | ||
comparator: (x: any, y: any) => boolean = Object.is | ||
): value is T => { | ||
return arr.some((item) => comparator(item, value)); | ||
}; |
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export * from './chunk'; | ||
export * from './contain'; | ||
export * from './countOccurrencesInArray'; | ||
export * from './excludeElements'; | ||
export * from './chunk'; |