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20 lines
577 B
TypeScript
20 lines
577 B
TypeScript
import { isArray } from './types'
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export const unique = <T>(arr: T[]) => [...new Set(arr)]
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export const extractFirst = <T>(arr: T | T[]): T => {
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return isArray(arr) ? arr[0] : arr
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}
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type Many<T> = T | ReadonlyArray<T>
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// TODO: rename to `ensureArray`
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/** like `_.castArray`, except falsy value returns empty array. */
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export const castArray = <T>(arr: Many<T>): T[] => {
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if (!arr && (arr as any) !== 0) return []
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return isArray(arr) ? arr : [arr as T]
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}
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// TODO: remove import alias
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// avoid naming conflicts
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export { castArray as ensureArray } from 'lodash-unified'
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