Explanation on Reddit: https://www.reddit.com/r/javascript/comments/3m6wyu/found_this_line_in_the_react_codebase_made_me/cvcyo4a https://www.reddit.com/r/javasc

Explanation on Reddit: https://www.reddit.com/r/javascript/comments/3m6wyu/found_this_line_in_the_react_codebase_made_me/cvcyo4a https://www.reddit.com/r/javascript/comments/3m6wyu/found_th...