function track()

in react/features/base/tracks/reducer.js [55:116]
52 lines of code
13 McCabe index (conditional complexity)

function track(state, action) {
    switch (action.type) {
    case PARTICIPANT_ID_CHANGED:
        if (state.participantId === action.oldValue) {
            return {
                ...state,
                participantId: action.newValue
            };
        }
        break;

    case TRACK_UPDATED: {
        const t = action.track;

        if (state.jitsiTrack === t.jitsiTrack) {
            // Make sure that there's an actual update in order to reduce the
            // risk of unnecessary React Component renders.
            for (const p in t) {
                if (state[p] !== t[p]) {
                    // There's an actual update.
                    return {
                        ...state,
                        ...t
                    };
                }
            }
        }
        break;
    }
    case TRACK_UPDATE_LAST_VIDEO_MEDIA_EVENT: {
        const t = action.track;

        if (state.jitsiTrack === t) {
            if (state.lastMediaEvent !== action.name) {

                return {
                    ...state,
                    lastMediaEvent: action.name
                };
            }
        }
        break;
    }
    case TRACK_NO_DATA_FROM_SOURCE: {
        const t = action.track;

        if (state.jitsiTrack === t.jitsiTrack) {
            const isReceivingData = t.jitsiTrack.isReceivingData();

            if (state.isReceivingData !== isReceivingData) {
                return {
                    ...state,
                    isReceivingData
                };
            }
        }
        break;
    }
    }

    return state;
}