How to use Keywords in TypeScript In Typescript

Using keyword will become a useful keyword for the management of the resources specifically when the resources are bounded by a specific amount of time or when the resource needs to be closed after using it, for example, one resource like this might be the database connections that needs to be closed or released after it is used.

Example:

{
  const getResource = () => {
    return {
      [Symbol.dispose]: () => {
        console.log(Welcome from w3wiki!')
      }
    }
  }

  using resource = getResource();
} // Welcome from w3wiki! Will be logged to the console.

Code Explanation:

The above code has a const keyword which is being used for constructing the getResource function that returns the value to the console.log. Here symbol. dispose is being used which is not available in the new releases of typescript because as we have discussed the keyword itself is in the discussion phase and isnt available for the public. In the next line of the code, a keyword is used to define a resource from the getResource() function to return the console.log message.

The new version of TypeScript introduces support for the “using” keyword used for the Explicit Resource Management feature in the ECMAScript, the using keyword is a keyword that aims to sort the facility for “cleanup” after creating any object.

The need for “using” keywords in both TypeScript and JavaScript is because it allows the developers to perform necessary actions like closing the connections for the network, release of memory, deletion of temporary files, etc.