Function cacheState

src/workbench/browser/src/ng1/lib/angular/angular.js:6865–6877

()

        var lastCachedState = null;

        function cacheState() {
            // This should be the only place in $browser where `history.state` is read.
            cachedState = getCurrentState();
            cachedState = isUndefined(cachedState) ? null : cachedState;

            // Prevent callbacks fo fire twice if both hashchange & popstate were fired.
            if (equals(cachedState, lastCachedState)) {
                cachedState = lastCachedState;
            }

            lastCachedState = cachedState;
            lastHistoryState = cachedState;
        }

        function fireStateOrUrlChange() {
            var prevLastHistoryState = lastHistoryState;