Created
January 17, 2018 20:58
-
-
Save RichieAHB/8cc0e3fa356403b36f4f1cef5ec7c2ce to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import React from 'react'; | |
import { render } from 'react-dom'; | |
import memoize from "lodash.memoize"; | |
const somethingExpensive = iters => { | |
const arr = []; | |
for (let i = 0; i < iters; i += 1) { | |
arr.push(Math.random()); | |
arr.sort(); // ¯\_(ツ)_/¯ | |
} | |
return arr[Math.floor(iters / 2)]; | |
}; | |
const memoizedSomethingExpensive = memoize(somethingExpensive); | |
class Inner extends React.Component { | |
render() { | |
const then = performance.now(); | |
const val = memoizedSomethingExpensive(this.props.iters); | |
const duration = (performance.now() - then) / 1000; | |
return ( | |
<div> | |
Value {val.toFixed(3)} was calculated as the median random number in {duration.toFixed(3)} seconds for {this.props.iters} random number | |
</div> | |
); | |
} | |
} | |
class Outer extends React.Component { | |
state = { | |
iterIndex: 0, | |
} | |
handleClick = () => this.setState({ | |
iterIndex: (this.state.iterIndex + 1) % this.props.iterToggles.length | |
}); | |
render() { | |
return ( | |
<div> | |
<button onClick={this.handleClick}>Toggle iters</button> | |
<Inner iters={this.props.iterToggles[this.state.iterIndex]} /> | |
</div> | |
); | |
} | |
} | |
render(<Outer iterToggles={[1, 2000, 3000]} />, document.getElementById('root')); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment