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test: Add test cases for take
(#252)
Co-authored-by: Sojin Park <raon0211@toss.im>
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@ -94,7 +94,7 @@ Even if a feature is marked "in review," it might already be under review to ens
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| [sortedUniq](https://lodash.com/docs/4.17.15#sortedUniq) | No support |
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| [sortedUniqBy](https://lodash.com/docs/4.17.15#sortedUniqBy) | No support |
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| [tail](https://lodash.com/docs/4.17.15#tail) | ✅ |
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| [take](https://lodash.com/docs/4.17.15#take) | 📝 |
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| [take](https://lodash.com/docs/4.17.15#take) | ✅ |
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| [takeRight](https://lodash.com/docs/4.17.15#takeRight) | 📝 |
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| [takeRightWhile](https://lodash.com/docs/4.17.15#takeRightWhile) | 📝 |
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| [takeWhile](https://lodash.com/docs/4.17.15#takeWhile) | 📝 |
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22
src/compat/array/take.spec.ts
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src/compat/array/take.spec.ts
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@ -0,0 +1,22 @@
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import { describe, expect, it } from 'vitest';
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import { take } from './take.ts';
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describe('take', () => {
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const array = [1, 2, 3];
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it('should take the first two elements', () => {
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expect(take(array, 2)).toEqual([1, 2]);
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});
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it('should return an empty array when `n` < `1`', () => {
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[0, -1, -Infinity].forEach(n => {
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expect(take(array, n)).toEqual([]);
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});
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});
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it('should return all elements when `n` >= `length`', () => {
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[3, 4, 2 ** 32, Infinity].forEach(n => {
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expect(take(array, n)).toEqual(array);
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});
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});
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});
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31
src/compat/array/take.ts
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src/compat/array/take.ts
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import { take as takeToolkit } from '../../array/take.ts';
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/**
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* Returns a new array containing the first `count` elements from the input array `arr`.
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* If `count` is greater than the length of `arr`, the entire array is returned.
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*
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* @template T - Type of elements in the input array.
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*
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* @param {T[]} arr - The array to take elements from.
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* @param {number} count - The number of elements to take.
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* @returns {T[]} A new array containing the first `count` elements from `arr`.
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*
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* @example
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* // Returns [1, 2, 3]
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* take([1, 2, 3, 4, 5], 3);
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*
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* @example
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* // Returns ['a', 'b']
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* take(['a', 'b', 'c'], 2);
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*
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* @example
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* // Returns [1, 2, 3]
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* take([1, 2, 3], 5);
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*/
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export function take<T>(arr: readonly T[], count: number): T[] {
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if (count < 1) {
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return [];
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}
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return takeToolkit(arr, count);
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}
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