javascript - Ramda，在函数中发送参数

Question

const product = {
  name: 'widget',
  price: 10,
  avgRating: 4.5,
  shippingWeight: '2 lbs',
  shippingCost: 2,
  shippingMethod: 'UPS'
}

const getProps = R.pick(['name', 'price'])
const result = getProps(product) // {name: 'widget', price: 10}

在我的 getProps 中，我想动态发送 key (名称和价格)。

类似

const getProps = args => R.pick([..args]);
const result = getProps(['name', 'price'], product); 

不起作用。

我应该怎么做？

https://plnkr.co/edit/MHv5AMEO3p9dxiNCvQ80?p=preview

Answer 1

在您的选择中，您没有正确传递对象( as per the R.pick documentation )。

你可以这样做:

const product = {
  name: 'widget',
  price: 10,
  avgRating: 4.5,
  shippingWeight: '2 lbs',
  shippingCost: 2,
  shippingMethod: 'UPS'
}

const getProps = (obj, propsArr) => R.pick(obj, propsArr)

console.log(getProps(['name','price'], product))
console.log(getProps(['avgRating','shippingMethod'], product))

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.min.js"></script>

或者您可以像这样解构传递的参数:

const product = {
  name: 'widget',
  price: 10,
  avgRating: 4.5,
  shippingWeight: '2 lbs',
  shippingCost: 2,
  shippingMethod: 'UPS'
}

const getProps = (...args) => R.pick(...args)

console.log(getProps(['name','price'], product))
console.log(getProps(['shippingCost','shippingMethod'], product))

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.min.js"></script>