ES6 Computed property names allow you to dynamically create property names using an expression in brackets ([ ]) similar to property accessors. Below, computed property names are demonstrated using Object Literals, ES6 Classes and ES6 Symbols.
This feature is available in Chrome 42 behind the --harmony-computed-property-names flag. For step-by-step instructions on how to use command-line flags with Chrome, read the command-line flags guide. In this case, you would launch Chrome with --args --js-flags="--harmony-computed-property-names".