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[React] Update State in React with Ramda's Evolve
In this lesson we‘ll take a stateful React component and look at how we can refactor our setState calls to use an updater function and then leverage Ramda‘s evolvefunction to make our updater function a reusable utility that isn‘t tied to the React API.
//@flowimport React from ‘react‘;import {inc, dec, lensProp, over, evolve, multiply} from ‘ramda‘;// Using Lenseconst countLens = lensProp(‘count‘);const increase = over(countLens, inc);const decrease = over(countLens, dec);const doubleCount = evolve({count: multiply(2)});export default class Counter extends React.Component { state = { count: 0 }; increase = () => this.setState(increase); decrease = () => this.setState(decrease); double = () => this.setState(doubleCount); render() { return ( <div> <button onClick={this.increase}>+</button> {this.state.count} <button onClick={this.decrease}>-</button> <button disabled={this.state.count === 0} onClick={this.double} >*2</button> </div> ); }}
[React] Update State in React with Ramda's Evolve
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