Created
August 28, 2023 05:30
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toFunctional
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| function toFunctional<T extends Function>(func: T): Function { | |
| const fullArgCount = func.length; | |
| function createSubFunction(curriedArgs: unknown[]) { | |
| return function(this: unknown) { | |
| const newCurriedArguments = curriedArgs.concat(Array.from(arguments)); | |
| if (newCurriedArguments.length > fullArgCount) { | |
| throw new Error('Too many arguments'); | |
| } | |
| if (newCurriedArguments.length === fullArgCount) { | |
| return func.apply(this, newCurriedArguments); | |
| } | |
| return createSubFunction(newCurriedArguments); | |
| }; | |
| } | |
| return createSubFunction([]); | |
| } | |
| interface MapperFunc<I, O> { | |
| (): MapperFunc<I, O>; | |
| (input: I[]): O[]; | |
| } | |
| interface MapFunc { | |
| (): MapFunc; | |
| <I, O>(mapper: (item: I) => O): MapperFunc<I, O>; | |
| <I, O>(mapper: (item: I) => O, input: I[]): O[]; | |
| } | |
| export const map = toFunctional(<I, O>(fn: (arg: I) => O, input: I[]) => input.map(fn)) as MapFunc; | |
| interface FiltererFunc<I> { | |
| (): FiltererFunc<I>; | |
| (input: I[]): I[]; | |
| } | |
| interface FilterFunc { | |
| (): FilterFunc; | |
| <I>(filterer: (item: I) => boolean): FiltererFunc<I>; | |
| <I>(filterer: (item: I) => boolean, input: I[]): I[]; | |
| } | |
| export const filter = toFunctional(<I>(fn: (item: I) => boolean, input: I[]) => input.filter(fn)) as FilterFunc; |
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