Update index.md (#19452)
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Randell Dawson
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@ -3,51 +3,23 @@ title: Use the Lifecycle Method componentWillMount
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---
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## Use the Lifecycle Method componentWillMount
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This challenges introduces the ``` componentWillMount ``` Lifecycle method. This is used to set state after a giventime period.
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The challenge is a basic introduction to React's LifeCycle components.
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These methods are also called Lifecycle Hooks.
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The syntax for the method is:
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```javascript
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componentDidMount() {
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setTimeout( () => {
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this.setState({
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one: 1,
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two: false
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});
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}, interval);
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}
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```
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where ``` one ``` and ``` two ``` are states you want to set after ``` interval ```ms.
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### Hint 1
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### Hint
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Log something to the console in the ```react componentWillMount ``` method.
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Use
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```javascript
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this.state.stateName
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```
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and change ``` stateName ``` as required.
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### Hint 2
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The `` console.log(); `` statement is used to log to the browser console.
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### Solution
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Change
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```javascript
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render() {
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return (
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<div>
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<h1>Active Users: { /* change code here */ }</h1>
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</div>
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);
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}
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```
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to
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Since you can log anything, use the ``` console.log(); ``` and pass in a string. The ``` componentWillMount ``` method should look like:
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```javascript
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render() {
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return (
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<div>
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<h1>Active Users: { this.state.activeUsers }</h1>
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</div>
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);
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}
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componentWillMount() {
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console.log('Component being mounted');
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}
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```
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##### Note: The ``` componentWillMount ``` Lifecycle method has been deprecated as of version 17, and does not work on later versions. [(Source)](https://reactjs.org/docs/react-component.html)
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