complete hourglassSum

src/retry.js

@@ -0,0 +1,36 @@
+// Write a function that to retries a request after a delay
+
+const setTimeoutPromise = async (delayMS) => {
+    return new Promise(resolve => {
+        setTimeout(resolve, delayMS);
+    });
+}
+
+const retry = (cb, delayMS, maxAttempts, attempts = 0) => {
+
+    return new Promise((resolve, reject) => {
+        if (attempts >= maxAttempts) {
+            reject('Max Attempts Failure');
+        } else {
+            try {
+                resolve(cb());
+            } catch (err) {
+                setTimeoutPromise(delayMS)
+                    .then(() => {
+                        retry(cb, delayMS, maxAttempts, ++attempts)
+                            .catch(() => { reject('Max Attempts Failure') });
+                    })
+                    .catch(() => { reject('Max Attempts Failure') });
+            }
+        }
+    });
+}
+
+const callback = () => {
+    throw new Error('whoops!');
+    return 'Hello';
+}
+
+retry(callback, 500, 3)
+    .then(console.log)
+    .catch(err => console.log('final error', err));

src/rotArrLeft.js

@@ -15,3 +15,11 @@
 function rotLeft(arr, d) {
 
 }
+
+const test1 = [1,2,3,4,5];
+
+console.log('rotLeft(test1, 2)', rotLeft(test1, 2)); // [3,4,5,1,2]
+// console.log('rotLeft(test1, 5)', rotLeft(test1, 5)); // [1,2,3,4,5]
+
+
+//abbrevaite word accesibility => a11y