JavaScript Polyfills and Fallbacks

Feature detection, polyfills such as `core-js` and hand-written fallbacks that let modern JavaScript features run in older browsers and runtimes.

Content tagged polyfills

• Tutorial:Native JavaScript Set Methods: union, intersection and difference

  Compare two Sets natively, with no array conversion.

  Compare JavaScript Sets with native union(), intersection(), difference() and more: usage, browser support, edge cases and a fallback.