Promise.whenAllSettled

Promise.whenAllSettled.js

/**
 * 所有Promise都被 settled
 * @param {[{promise: function():Promise, data: {}}]} promises
 * @retu {Promise<[{isResolve: boolean, isReject: boolean, error: {}, result: {}, data: {}}]>}
 */
Promise.whenAllSettled = function (promises) {
    const isPromise = function (obj) {
        return obj && typeof obj.then === "function" && typeof obj.catch === "function";
    };

    const mapedPromises = promises
        .map(item => {
            if (isPromise(item)) {
                return { promise: item, data: undefined };
            }
            if (item && isPromise(item.promise)) {
                return item;
            }
            return {
                promise: Promise.reject(new Error("invalid_promise")),
                data: item
            };
        })
        .map(item => item.promise.then(result => {
            return {
                isResolve: true,
                isReject: false,
                result: result,
                data: item.data
            }
        }, error => {
            return {
                isResolve: false,
                isReject: true,
                error: error,
                data: item.data
            };
        }));

    return Promise.all(mapedPromises);
}