How can I output both the key and value of my state?

I want to be able to output both the key and the value of the key of items in my state. I tried using [this.state[field]] but that didn't work either.

[this.state[field]]

Example:
https://jsfiddle.net/n5u2wwjg/164470/

class App extends React.Component
constructor(props)
super(props)
this.state =
type: 'valueOfType',
subType: 'valueOfSubType',
anotherThing: 'valueOfOther'



renderItem = (field) =>
return <div>['nameOfKey']: field</div>


render()
const type, subType, anotherThing = this.state;
return (
<div>
<p><strong>Actual output:</strong></p>
this.renderItem(type)
this.renderItem(subType)
this.renderItem(anotherThing)

<hr/>
<p><strong>Desired output:</strong></p>
<div>type: valueOfType</div>
<div>subType: valueOfSubType</div>
<div>anotherThing: valueOfOther</div>
</div>
)




this.state[field]

renderItem

1 Answer
1

As @Li357 suggested you can pass the key as a string and use it like this.state[field] in your method. Alternatively, you can use Object.entries and map to render all the fields.

this.state[field]

Object.entries

map

class App extends React.Component
constructor(props)
super(props)
this.state =
type: 'valueOfType',
subType: 'valueOfSubType',
anotherThing: 'valueOfOther'



renderItem = (field) =>
return <div>field: this.state[field]</div>


renderAll = () => Object.entries( this.state ).map( ([key,value]) =>
<p>key:value</p>
);

render()
return (
<div>
<p><strong>Actual output:</strong></p>
this.renderItem("type")
this.renderItem("subType")
this.renderItem("anotherThing")

<hr />
this.renderAll()

<hr />
<p><strong>Desired output:</strong></p>
<div>type: valueOfType</div>
<div>subType: valueOfSubType</div>
<div>anotherThing: valueOfOther</div>
</div>
)



ReactDOM.render(<App />, document.getElementById("root"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="root"></div>

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