ES6 adds string interpolation and custom string literals! https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/template_strings Remarkable for a language requiring backwards compat.
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Super impressed that I received an elisp PR that discusses backwards compatibility to 1997!
Emacs command of the day: pop-global-mark, bound to C-x C-SPC. Perfect for navigating backwards (previous positions in previous buffers).
The tragedy of backwards compatibility: Excel still considers 1900 to be leap year and doesn't plan to fix it: http://t.co/c52HXkaiEP