I do think they have added some good stuff to JavaScript, such as typed arrays, big integers, arrow functions, strict mode, generator functions, WeakMap, symbol type, etc.
But some features of JavaScript, I don't like much, such as automatic semicolon insertion. Some features I find unnecessary.
And some stuff I thought they ought to add but didn't, such as a goto command, macros, a popcount function for big integers, a built-in regular expression quotation function (it can be implemented easily enough, but it seem the thing that should be built-in), and a big integer date function (low priority, but maybe in the far future, it ought to be added).
But some features of JavaScript, I don't like much, such as automatic semicolon insertion. Some features I find unnecessary.
And some stuff I thought they ought to add but didn't, such as a goto command, macros, a popcount function for big integers, a built-in regular expression quotation function (it can be implemented easily enough, but it seem the thing that should be built-in), and a big integer date function (low priority, but maybe in the far future, it ought to be added).