React native null value checking

Question

how can I check this markerPosition value is null or not, I need to assign it a variable laying if its null.

  onSendPress() {
    const { message, markerPosition } = this.props;
    this.props.dispatch({
      type: 'Message/messageSend',
      payload: { message, markerPosition }
    });
  }

Just wanted to confirm that you are binding props correctly? i.e. your constructor does call super(props)? See this issue — aug
– aug, Commented May 10, 2017 at 19:42
yes just it calls null and crash its very simple just an if statement is enough — nuodez
– nuodez, Commented May 10, 2017 at 20:20
so to clarify you figured it out and the answer is a simple if statement correct? If so, feel free to close this out. — aug
– aug, Commented May 10, 2017 at 20:46

TheFuquan · Accepted Answer · 2017-05-10 21:56:07Z

1

If you are talking about ensuring that the markerPosition is not null and falling back to a default value, try this then:

onSendPress() {
    const { message, markerPosition= "default value" } = this.props;
    // now if this.props.markerPosition is not defined
    // markerPosition holds the value "default value"

    this.props.dispatch({
      type: 'Message/messageSend',
      payload: { message, markerPosition }
    });
  }

answered May 10, 2017 at 21:56

TheFuquan

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