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nested-curry

v1.0.0

Published

simple curry with parameter nested object

Downloads

6

Readme

nested-curry

중첩된 객체를 지원하는 커리 함수입니다.

커리가 뭐에요?

커리가 무엇이고 유용하게 쓰는 방법에 대해 아래 링크에서 배울 수 있습니다.

  • https://ko.javascript.info/currying-partials

어떻게 써요?

npm에서 아래와 같이 설치 할 수 있습니다.

$ npm i nested-curry

설치하고 이렇게 사용합니다.

    const curry = require("nested-curry")
    const sum = ({a, b, c}) => a + b + c
    console.log( sum({a : 1})({b : 2})({c : 3})() ) // 결과 : 6

더 없어요?

일반 커링

다른 커링 함수와 같이 일반 파라미터로 전달 할 수 있습니다.

    let sumed = curry((...nums) => nums.reduce((a,b) => a + b))  
    console.log(sum()(1)(2)(3)(4)(5)) //15;

중첩객체 예제

덮어씌우려는 객체가 동일한 구조를 가지고 있을 때, 변경되지 않는 프로퍼티는 유지됩니다.

    let printLocation = curry(
      ({age,name,location:{state,city}}) => 
          console.log(`${age}살 ${name}는 ${state}시 ${city}에 살아요.`)
      )
    ({
      age: 18,
      name: '성욱이',
      female: true,
      location: {
        state:"부산",
        city:"해운대구",
      }
    })
    printLocation(); //18살 성욱이는 부산시 해운대구에 살아요.;
    printLocation({location:{city:'금정구'}})() //18살 성욱이는 부산시 금정구에 살아요.

불변성

일반적으로 커링된 파라미터 객체들은 이뮤터블 상태가 유지됩니다.

    let sayHello = curry(({str}) => `hello ${str}!`)
    let param = {str:"curry"};
    let helloToCurry = sayHello(param);
    param.str = 'cutlet'
    console.log(helloToCurry()) //'hello curry!'

객체들이 뮤터블 상태를 유지하길 원한다면 처음 함수 전달시 아래와 같은 옵션을 같이 넘겨주면 됩니다.

    let options = { mutable : true }
    let sayHello = curry(({str}) => `hello ${str}!`, options)
    let param = {str:"curry"};
    let helloToCurry = sayHello(param);
    param.str = 'cutlet'
    console.log(helloToCurry()) //'hello curry!'

커리 컴바인

일반 파라미터와 객체 파라미터를 동시에 사용 할 수 있습니다.

    let returnResult = curry((...params) => params)
    let returnMixed = returnResult
      ({foo1:'bar1'})
      (1)
      ({foo2:'bar3'})
      ({foo123:'bar321'})
      (2,3)
      (['apple','banana'])
    let result = returnMixed(); 
    console.log(result) // [{ foo1: 'bar1' },1,{ foo2: 'bar3', foo123: 'bar321' },2,3,{ '0': 'apple', '1': 'banana' },null]

커리 체이닝

함수를 여러번 전달해서 아래와 같은 파이프라인식 구현을 할 수 있습니다.

이전 파라미터는 가장 뒤쪽에 들어옵니다.

    let tagging = ({tagName}, children) => `<${tagName}>${children}</${tagName}>`  
    let boldRice = curry(tagging)({tagName:"b"})('rice');
    console.log(boldRice()) //`<b>rice</b>`

    let removedBoldRice = boldRice(tagging)({tagName:"del"})
    console.log(removedBoldRice()) //`<del><b>rice</b></del>`)

    let styledBoldRice = boldRice(({style,id},child) => 
    `<span id="${id}" style="${ 
      Object.entries(style).map(([key,id]) => `${key}:${id};`)
    }">${child}</span>`,
    {
      style:{
        fontSize:"1.2em",
        color:"#4CAF50"
      },
      id:"bigrice",
    })
    console.log(styledBoldRice()) //`<span id="bigrice" style="fontSize:1.2em;color:#4CAF50;"><b>rice</b></span>`