felixgirault/essence.js

/**
 *    Creates a condition that will execute the given middleware
 *    if the predicate returns true.
 *
 *    @param function predicate Predicate.
 *    @param function middleware Middleware.
 *    @return function Condition.
 */
export default function createCondition(predicate, middleware) {

    /**
     *    Returns the given payload optionnaly updated by
     *    the middleware.
     *
     *    @param object payload Payload.
     *    @return object Updated payload.
     */
    return async (payload) =>
        predicate(payload)
            ? await middleware(payload)
            : payload;
}