juliette/lib/selectors.js

Reactive State Management Powered by RxJS

export function composeSelectors(selectors, composer) {
    let cachedResult;
    let cachedSlices;
    return state => {
        const newSlices = selectors.map(selector => selector(state));
        if (!cachedResult || cachedSlices.some((cachedSlice, i) => cachedSlice !== newSlices[i])) {
            cachedResult = composer(...newSlices);
            cachedSlices = newSlices;
        }
        return cachedResult;
    };
}
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