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/ answers: 1 / hits: 25678
/ 7 Years ago, tue, march 28, 2017, 12:00:00
I am a complete newbie in react native, react.js, and javascript. I am Android developer so would like to give RN a try.
Basically, the difference is in onPress;
This code shows 'undefined' when toggle() runs:
class LoaderBtn extends Component {
constructor(props) {
super(props);
this.state = { loading: false };
}
toggle() {
console.log(this.state);
// let state = this.state.loading;
console.log(Clicked!)
// this.setState({ loading: !state })
}
render() {
return (
<Button style={{ backgroundColor: '#468938' }} onPress={this.toggle}>
<Text>{this.props.text}</Text>
</Button>
);
}
}
but this code works:
class LoaderBtn extends Component {
constructor(props) {
super(props);
this.state = { loading: false };
}
toggle() {
console.log(this.state);
// let state = this.state.loading;
console.log(Clicked!)
// this.setState({ loading: !state })
}
render() {
return (
<Button style={{ backgroundColor: '#468938' }} onPress={() => {this.toggle()}}>
<Text>{this.props.text}</Text>
</Button>
);
}
}
Can you explain me the difference, please?
In Java / Kotlin we have method references, basically it passes the function if signatures are the same, like onPress = () => {} and toggle = () => {}
But in JS it doesn't work :(
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