Recently I have started learning about react-native and I am currently utilizing it for my school assignment. Prior to this, I was working with ionic.
My current task involves filtering data that is stored in JSON format. I'm curious to know if react-native has a built-in filter similar to what I used in ionic?
Reference: Angular Filter
Definitely Not.
The Ionic directive called filter handles filtering logic even before entering the for loop. Therefore, you have the option to perform your own filtering prior to rendering.
You can achieve this by utilizing ES6 filter function or other utility functions.
For example, let's say we want to display only odd numbers:
render() {
return(
<View>
{[1, 2, 3, 4, 5]
.filter(value => value % 2 === 1)
.map(value => (<Text key={value}>{value}</Text>))}
</View>
);
}
To take it a step further, you can create a component with a filter property and implement custom logic. This way, you can use it similar to how Ionic works.
For instance:
class FilterNumbers extends Component {
static propTypes = {
numbers: PropTypes.array.isRequired,
filter: PropTypes.func,
};
static defaultProps = {
filter: null,
numbers: [],
};
render() {
var filteredNumbers = this.props.numbers;
if (this.props.filter) {
filteredNumbers = this.props.numbers.filter(this.props.filter);
}
return (
<View>
{filteredNumbers.map(value => (<Text key={value}>{value}</Text>))}
</View>);
};
}
Usage example:
<FilterNumbers numbers={[1, 2, 3, 4, 5]} filter={value => value % 2 === 1}/>
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