Unable to access value from array with objects in React native

Question

I'm unable to access value's from a state array filled with objects.

I got the values when I stored them in an array, but when I try to console.log the state, it prints out: [Object Object] . I have tried the following to get the value, example:

var data=[{"coordinate":{"longitude":73.8679075241089,"latitude":18.515422222637756},"key":0,"color":"#ffc130"}];

console.log("data"+data[0].coordinate.longitude);

This is how I tried to get the value in React Native:

    console.log("location "+JSON.stringify(this.state.markers));
    var data=JSON.stringify(this.state.markers);
    console.log("datamap"+JSON.parse(data));
    var dataparse = JSON.parse(data);
    console.log("data parse "+this.state.markers[0].coordinate.latitude);

This is where I declared the array:

class DefaultMarkers extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      region: {
        latitude: LATITUDE,
        longitude: LONGITUDE,
        latitudeDelta: LATITUDE_DELTA,
        longitudeDelta: LONGITUDE_DELTA,
      },
      markers: [],
    };
  }

I want to store the latitude and longitude in an array.

Answer 1

我使用JSON.parse（）和JSON.stringify（）进行解析

const data = JSON.parse(JSON.stringify(this.state.markers));

Answer 2

Change your console.log, separate two values with the comma instead concatenating them.

Change from

console.log("location "+JSON.stringify(this.state.markers));

To

console.log("location ", JSON.stringify(this.state.markers));

Hope you will be able to print the value.