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March 30, 2022 21:26
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/* eslint-disable */ | |
type FilterFunction<In = any, Out = any> = (input: In, next: (flow: boolean, nextInput: Out) => any) => any | |
export function pipelineSync<FirstIn, FirstOut>(first: FilterFunction<FirstIn, FirstOut>) { | |
const pipeline: Array<FilterFunction> = [first] | |
const run = (input: FirstIn): any => pipeline | |
.reduceRight((nextFunc, currentFunc, index) => { | |
return (index === 0) | |
? currentFunc(input, nextFunc) | |
: (flow: boolean, output: any) => flow | |
? currentFunc(output, nextFunc) | |
: undefined | |
}, (flow: boolean, output: any) => flow ? output : undefined) | |
type Pipe<CurrOut> = { | |
pipe: <NextOut>(func: FilterFunction<CurrOut, NextOut>) => Pipe<NextOut> | |
run: Execute<FirstIn, CurrOut> | |
} | |
type Execute<FirstIn, LastOut> = (input: FirstIn) => LastOut | |
const pipe = <CurrIn, CurrOut>(func: FilterFunction<CurrIn, CurrOut>): Pipe<CurrOut> => { | |
pipeline.push(func) | |
return { | |
pipe, | |
run | |
} | |
} | |
return pipe(first) | |
} | |
const toUpper: FilterFunction<string, string> = (input, next): void => | |
next(true, input.toUpperCase()) | |
const replaceSpaces: FilterFunction<string, string> = (input, next): void => | |
next(true, input.replace(' ', '-')) | |
const saluteFromPipes: FilterFunction<string, string> = (input, next): void => | |
next(true, input.concat(" from pipes")) | |
const duplicateString: FilterFunction<string, string> = (input, next): void => | |
next(true, input.concat(input)) | |
const getLength: FilterFunction<string, number> = (input, next): void => | |
next(true, input.length) | |
// DEMO execution | |
const result = pipelineSync(toUpper) // HELLO WORLD | |
.pipe(replaceSpaces) // HELLO-WORLD | |
.pipe(saluteFromPipes) // HELLO-WORLD from pipes | |
.pipe(duplicateString) // HELLO-WORLD from pipesHELLO-WORLD from pipes | |
.pipe(getLength) // 44 | |
/* Executes from first and returns last successful chain value */ | |
.run('hello world') | |
console.log(result) // |
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