peterdee · July 8, 2019 18:06 · Jul 8, 2019
diff --git a/promisification.md b/promisification.md
@@ -0,0 +1,40 @@
+```javascript
+function createPromises(length) {
+    const promises = [];
+    for (let i = 0; i < length; i += 1) {
+        const value = Math.random();
+        promises.push(new Promise((resolve, reject) => setTimeout(() => {
+            if (value < 0.1) reject('exception');
+            resolve(value);
+        }, value * 1000)));
+    }
+    return promises;
+}
+
+async function resolver(array) {
+    const results = array.map(async (promise) => {
+        try {
+              const result = await promise;
+              return result;
+        } catch (err) {
+            return 0;
+        }
+    });
+    return results;
+}
+
+async function sum(promises) {
+    try {
+        const promised = await resolver(promises);
+        const results = await Promise.all(promised);
+        return console.log(results.reduce((a, i) => {
+            a += i;
+            return a;
+        }, 0));
+    } catch(err) {
+        return console.log(err.stack || err);    
+    }
+}
+
+sum(createPromises(100));
+```