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createSelector reselect library

Fares Abuali answered on October 15, 2022 Popularity 8/10 Helpfulness 2/10

answer createSelector reselect library

createSelector reselect library

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import { createSelector } from 'reselect'

const selectShopItems = state => state.shop.items
const selectTaxPercent = state => state.shop.taxPercent

const selectSubtotal = createSelector(selectShopItems, items =>
  items.reduce((subtotal, item) => subtotal + item.value, 0)
)

const selectTax = createSelector(
  selectSubtotal,
  selectTaxPercent,
  (subtotal, taxPercent) => subtotal * (taxPercent / 100)
)

const selectTotal = createSelector(
  selectSubtotal,
  selectTax,
  (subtotal, tax) => ({ total: subtotal + tax })
)

const exampleState = {
  shop: {
    taxPercent: 8,
    items: [
      { name: 'apple', value: 1.2 },
      { name: 'orange', value: 0.95 }
    ]
  }
}

console.log(selectSubtotal(exampleState)) // 2.15
console.log(selectTax(exampleState)) // 0.172
console.log(selectTotal(exampleState)) // { total: 2.322 }

Popularity 8/10 Helpfulness 2/10 Language typescript

Source: www.npmjs.com

Tags: reselect typescript

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Contributed on Oct 15 2022

Fares Abuali

0 Answers Avg Quality 2/10

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