ECMAScript Language Specification

10

The ECMAScript Language Specification is the official, authoritative specification of the JavaScript programming language. ECMAScript 10 language specification was published in June 2019 and followed the ECMAScript 9 language specification.

This ECMAScript version goes beyond the previous version by specifying features like:

• The methods String.matchAll and Object.fromEntries

• The methods Array.flat and Array.flatMap

• The methods String.trimStart and String.trimEnd

• Dynamic imports async and await import

• catch without creating unused bindings:

  // old
  try {
    /* ... */
  } catch (err) {
    console.log("Do not need reference to the error");
  }
  
  // now
  try {
    /* ... */
  } catch {
    console.log("Do not need reference to the error");
  }