How to return the result of this function

@durvilchat wrote:

hello please help me I have a problem with this function I would like him to return the result of the search in the database my results are always wrong.

    test(value) {
        var res;
        this.storage.get('age').then((currencies) => {
            this.getCurrentCurrency().then((val) => {
                res = value * currencies[val]['rate'];

            });
        });
        return res;
    }

Thanks. I want to return res

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