javascript - ES6 classes don't work on Chrome 47

Question

Google Chrome claims to support ES6 classes since version 42, but it gives Uncaught SyntaxError: Unexpected token class(…) when i run the simple code from below in the console:

class Polygon {
  constructor(height, width) {
    this.name = 'Polygon';
    this.height = height;
    this.width = width;
  }

Firefox also doesn't work. Microsoft Edge works just fine. Is this normal?

Answer 1

Are you in "use strict" mode?

ES6 classes solve this by providing JavaScript a clean, standardized syntax for classes. This new syntax is available in Chrome 42 for JavaScript written in strict mode.