Function cache

e2e/samples/app/slate/source/javascripts/lib/_jquery.js:867–874

(key, value)

        var keys = [];

        function cache(key, value) {
          // Use (key + " ") to avoid collision with native prototype properties (see Issue #157)
          if (keys.push(key + " ") > Expr.cacheLength) {
            // Only keep the most recent entries
            delete cache[keys.shift()];
          }
          return (cache[key + " "] = value);
        }
        return cache;
      }