feat: add promises all settled

Author: chachaxw

js/promise.js

@@ -2,7 +2,7 @@
  * @Author: Chacha
  * @Date: 2022-04-19 22:33:05
  * @Last Modified by: Chacha
- * @Last Modified time: 2022-04-19 22:40:07
+ * @Last Modified time: 2022-04-20 23:28:20
  */
 
 /**
@@ -12,6 +12,10 @@
 
 Promise.myAll = (promises) => {
     return new Promise((resolve, reject) => {
+        if (!Array.isArray(promises)) {
+            return reject("Promise.myAll accepts an array");
+        }
+
         let count = 0;
         let result = [];
         const length = promises.length;
@@ -31,12 +35,63 @@ Promise.myAll = (promises) => {
     });
 };
 
+Promise.myAllSettled = (promises) => {
+    return new Promise((resolve, reject) => {
+        if (!Array.isArray(promises)) {
+            return reject("Promise.myAllSettled accepts an array");
+        }
+
+        const length = promises.length;
+        let result = [];
+        let remaining = length;
+
+        if (length === 0) {
+            return resolve(length);
+        }
+
+        const response = (i, value) => {
+            if (value instanceof Promise) {
+                value.then(
+                    (res) => {
+                        response(i, res);
+                    },
+                    (err) => {
+                        result[i] = {
+                            status: "rejected",
+                            reason: err,
+                        };
+
+                        if (--remaining === 0) {
+                            resolve(result);
+                        }
+                    }
+                );
+
+                return;
+            }
+
+            result[i] = {
+                status: "fulfilled",
+                value,
+            };
+
+            if (--remaining === 0) {
+                resolve(result);
+            }
+        };
+
+        for (let i = 0; i < length; i++) {
+            response(i, promises[i]);
+        }
+    });
+};
+
 let p1 = Promise.resolve(1);
 let p2 = 2;
 let p3 = new Promise((resolve) => {
     setTimeout(resolve, 100, 3);
 });
-// let p4 = Promise.reject("出错啦");
+let p4 = Promise.reject("出错啦");
 
 Promise.myAll([p1, p2, p3])
     .then((res) => {
@@ -45,3 +100,5 @@ Promise.myAll([p1, p2, p3])
     .catch((err) => {
         console.log("err", err);
     });
+
+Promise.myAllSettled([p1, p2, p4]).then(console.log);