Created
January 23, 2019 06:40
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Render prop component that returns a unique id
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| import warning from 'warning'; | |
| import { Component } from 'react'; | |
| let idCounter = 0; | |
| function nextId() { | |
| idCounter += 1; | |
| warning( | |
| idCounter < 1e10, | |
| 'Id: you might have a memory leak.' + | |
| 'The idCounter is not supposed to grow that much.' | |
| ); | |
| return idCounter; | |
| } | |
| /** | |
| * A simple render prop component that returns a unique id | |
| */ | |
| export default class Id extends Component { | |
| state = { | |
| id: nextId(), | |
| }; | |
| getId() { | |
| const { name } = this.props; | |
| const { id } = this.state; | |
| if (process.env.NODE_ENV === 'production') { | |
| return `uid${id}`; | |
| } | |
| return `${name || 'unnamed'}-${id}`; | |
| } | |
| render() { | |
| return this.props.children(this.getId()); | |
| } | |
| } |
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