Adding error first and promise examples

davidfekke · davidfekke · commit 1981d30fce23 · 2018-10-13T10:36:44.000-04:00
diff --git a/error-first-example.js b/error-first-example.js
@@ -0,0 +1,11 @@
+const fs = require('fs');
+const location = __dirname + '/sometext.txt';
+
+fs.readFile(location, 'utf-8', processFile);
+
+function processFile(err, result) {
+    if (err) {
+        console.error(err);
+    }
+    console.log(result);
+}
diff --git a/error-first-lambda.js b/error-first-lambda.js
@@ -0,0 +1,9 @@
+const fs = require('fs');
+const location = __dirname + '/howoldisJaxNode.txt';
+
+fs.readFile(location, 'utf-8', (err, results) => {
+    if (err) {
+        console.error(err);
+    }
+    console.log(results);
+});
diff --git a/howoldisJaxNode.txt b/howoldisJaxNode.txt
@@ -0,0 +1 @@
+The first JaxNode User Group met on October 16th, 2013.
diff --git a/promisify-example.js b/promisify-example.js
@@ -0,0 +1,11 @@
+const fs = require('fs');
+const util = require('util');
+const location = __dirname + '/sometext.txt';
+
+const readFileAsync = util.promisify(fs.readFile);
+
+readFileAsync(location, 'utf-8').then(data => {
+    console.log(data);
+}).catch(err => {
+    console.error(err);
+});
diff --git a/sometext.txt b/sometext.txt
@@ -0,0 +1 @@
+Happy Birthday 5th JaxNode User Group!!!
diff --git a/turn-errfirstcb-into-promise.js b/turn-errfirstcb-into-promise.js
@@ -0,0 +1,19 @@
+const fs = require('fs');
+const location = __dirname + '/sometext.txt';
+
+readFilePromise(location).then(result => {
+    console.log(result);
+}).catch(err => {
+    console.error(err);
+})
+
+function readFilePromise(path) {
+    return new Promise(function (resolve, reject) {
+        fs.readFile(path, 'utf-8', (err, result) => {
+            if (err) {
+                reject(err);
+            }
+            resolve(result);
+        })
+    });
+}

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+The first JaxNode User Group met on October 16th, 2013.`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+Happy Birthday 5th JaxNode User Group!!!`