Improve examples

Author: tshemsedinov

.eslintignore

@@ -1,2 +1,3 @@
 node_modules/
 Exercises/
+7-break.js

JavaScript/e-reduce.js

@@ -6,8 +6,9 @@ const sum = (acc, val) => (count++, acc + val);
 const res = arr.reduce(sum);
 console.log({ res, count });
 
-const reduce = (fn, acc, [cur, ...rest]) => cur === undefined ?
-  acc : reduce(fn, fn(acc, cur), rest);
+const reduce = (fn, acc, [cur, ...rest]) => (
+  cur === undefined ? acc : reduce(fn, fn(acc, cur), rest)
+);
 
 const res2 = reduce(sum, 0, arr);
 console.log({ res2 });

JavaScript/h-async.js

@@ -2,7 +2,7 @@
 
 const range = {
   start: 1,
-  end: 10,
+  end: 1000,
   [Symbol.asyncIterator]() {
     let value = this.start;
     return {
@@ -20,8 +20,15 @@ console.dir({
   symbols: Object.getOwnPropertySymbols(range),
 });
 
+let k = 0;
+
+const timer = setInterval(() => {
+  console.log('next ', k++);
+}, 10);
+
 (async () => {
   for await (const number of range) {
     console.log(number);
   }
+  clearInterval(timer);
 })();

JavaScript/i-async.js

@@ -0,0 +1,38 @@
+'use strict';
+
+const range = {
+  start: 1,
+  end: 1000,
+  [Symbol.asyncIterator]() {
+    let value = this.start;
+    return {
+      next: () => new Promise((resolve, reject) => {
+        setTimeout(() => {
+          resolve({
+            value,
+            done: value++ === this.end + 1
+          });
+        }, 0);
+      })
+    };
+  }
+};
+
+console.dir({
+  range,
+  names: Object.getOwnPropertyNames(range),
+  symbols: Object.getOwnPropertySymbols(range),
+});
+
+let k = 0;
+
+const timer = setInterval(() => {
+  console.log('next ', k++);
+}, 10);
+
+(async () => {
+  for await (const number of range) {
+    console.log(number);
+  }
+  clearInterval(timer);
+})();