score:178

Accepted answer

You can map the list of stations to ReactElements.

With React >= 16, it is possible to return multiple elements from the same component without needing an extra html element wrapper. Since 16.2, there is a new syntax <> to create fragments. If this does not work or is not supported by your IDE, you can use <React.Fragment> instead. Between 16.0 and 16.2, you can use a very simple polyfill for fragments.

Try the following

// Modern syntax >= React 16.2.0
const Test = ({stations}) => (
  <>
    {stations.map(station => (
      <div key={station.call} className='station'>{station.call}</div>
    ))}
  </>
); 

// Modern syntax < React 16.2.0
// You need to wrap in an extra element like div here

const Test = ({stations}) => (
  <div>
    {stations.map(station => (
      <div className="station" key={station.call}>{station.call}</div>
    ))}
  </div>
); 

// old syntax
var Test = React.createClass({
    render: function() {
        var stationComponents = this.props.stations.map(function(station) {
            return <div className="station" key={station.call}>{station.call}</div>;
        });
        return <div>{stationComponents}</div>;
    }
});
 
var stations = [
  {call:'station one',frequency:'000'},
  {call:'station two',frequency:'001'}
]; 

ReactDOM.render(
  <div>
    <Test stations={stations} />
  </div>,
  document.getElementById('container')
);

Don't forget the key attribute!

https://jsfiddle.net/69z2wepo/14377/

score:2

There are couple of way which can be used.

const stations = [
  {call:'station one',frequency:'000'},
  {call:'station two',frequency:'001'}
];
const callList = stations.map(({call}) => call)

Solution 1

<p>{callList.join(', ')}</p>

Solution 2

<ol>    
  { callList && callList.map(item => <li>{item}</li>) }
</ol>

Edit kind-antonelli-z8372

Of course there are other ways also available.

score:2

This is quite likely the simplest way to achieve what you are looking for.

In order to use this map function in this instance, we will have to pass a currentValue (always-required) parameter, as well an index (optional) parameter. In the below example, station is our currentValue, and x is our index.

station represents the current value of the object within the array as it is iterated over. x automatically increments; increasing by one each time a new object is mapped.

render () {
    return (
        <div>
            {stations.map((station, x) => (
                <div key={x}> {station} </div>
            ))}
        </div>
    );
}

What Thomas Valadez had answered, while it had provided the best/simplest method to render a component from an array of objects, it had failed to properly address the way in which you would assign a key during this process.

score:6

this.data presumably contains all the data, so you would need to do something like this:

var stations = [];
var stationData = this.data.stations;

for (var i = 0; i < stationData.length; i++) {
    stations.push(
        <div key={stationData[i].call} className="station">
            Call: {stationData[i].call}, Freq: {stationData[i].frequency}
        </div>
    )
}

render() {
  return (
    <div className="stations">{stations}</div>
  )
}

Or you can use map and arrow functions if you're using ES6:

const stations = this.data.stations.map(station =>
    <div key={station.call} className="station">
      Call: {station.call}, Freq: {station.frequency}
    </div>
);

score:59

I have an answer that might be a bit less confusing for newbies like myself. You can just use map within the components render method.

render () {
   return (
       <div>
           {stations.map(station => <div key={station}> {station} </div>)} 
       </div>
   );
}

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