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by Sacho 3385 days ago
Boost has existed since 1999-2000, which aligns with ES3.

As for solid and well-understood... Douglas Crockford wrote a book on how "solid" Javascript is, called "Javascript: The Good Parts". One of his most common refrains about JS was "Javascript is The World's Most Misunderstood Programming Language". [0][1]

ES5 came out in 2009. ES6 was standardized after React came out.

[0] - http://javascript.crockford.com/javascript.html

[1] - http://javascript.crockford.com/popular.html