reactjs - React access const outside of block scope

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Hi I am trying access a const which is assigned a value within the block scope of componentDidMount() and assign it within a different method but I am having difficulty achieving so. I have tried saving it to state, however 'something' is not defined within renderTable()

My code is as follows:

// Pseudo code:
class tableView extends Component {

 componentDidMount() 
 .......
 const something = 'blah';
 this.setState(something);
 
 renderTable() 
 const tableData = [
 
 name: 'Item 1',
 data: this.state.something,
 ,

 ];

 return 
 ......
 ;
 

Are there any other approaches to allow me access the something const within renderTable()?

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