How to return values from function - React native

Question

How to return a boolean value from react native function?

Jigar Shah · Accepted Answer · 2017-07-04 13:16:57Z

5

it can be accomplish like this:

export function isJson(str) {
  try {
    JSON.parse(str);
  } catch (e) {
    return false;
  }
  return true;
}

This function checks whether provided value is valid JSON or not.

answered Jul 4, 2017 at 13:16

Jigar Shah

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TBouder · Accepted Answer · 2017-07-04 14:45:57Z

3

If your function is in a class, you can do this (check toggleBool):

class IsTrue extends Component
{
    state = {isTrue: false}

    componentWillMount = () =>
    {
        const   newVal = this.toggleBool();

        this.setState({isTrue: newVal});
    }

    toggleBool = () =>
    {
        if (this.state.isTrue === false)
            return (true);
        return (false);
    }


    render = () => <Text>{this.state.isTrue}</Text>
}

answered Jul 4, 2017 at 14:45

TBouder

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