chore: improve a couple of code examples (#27)

Author: nathan-contino-mongo

source/code-snippets/crud/startrek.js

@@ -26,7 +26,7 @@ async function word(movies) {
   // end word text example
 
   // print a message if no documents were found
-  if ((await cursor.count()) == 0) {
+  if ((await cursor.count()) === 0) {
     console.log("No documents found!");
   }
   await cursor.forEach(console.dir);
@@ -95,7 +95,7 @@ async function relevance(movies) {
   // end relevance text example
 
   // print a message if no documents were found
-  if ((await cursor.count()) == 0) {
+  if ((await cursor.count()) === 0) {
     console.log("No documents found!");
   }
   await cursor.forEach(console.dir);

source/code-snippets/crud/theaters.js

@@ -58,7 +58,7 @@ async function range(theaters) {
   // end range geo example
 
   // print a message if no documents were found
-  if ((await cursor.count()) == 0) {
+  if ((await cursor.count()) === 0) {
     console.log("No documents found!");
   }
   await cursor.forEach(console.dir);

source/code-snippets/usage-examples/find.js

@@ -32,7 +32,7 @@ async function run() {
       .project(projection);
 
     // print a message if no documents were found
-    if (!(await cursor.hasNext())) {
+    if ((await cursor.count()) === 0) {
       console.log("No documents found!");
     }
 

source/code-snippets/usage-examples/insertMany.js

@@ -21,7 +21,7 @@ async function run() {
     const docs = [docOne, docTwo, docThree];
     // specify an additional options object
     const options = {};
-    options.ordered = true; // prevent additional documents from being prevented if one fails
+    options.ordered = true; // prevent additional documents from being inserted if one fails
     const result = await collection.insertMany(docs, options);
     console.log(`${result.insertedCount} documents were inserted`);
   } finally {

source/code-snippets/usage-examples/insertOne.js

@@ -12,7 +12,7 @@ async function run() {
 
     const database = client.db("sample_mflix");
     const collection = database.collection("movies");
-    // create a document object
+    // create a document to be inserted
     const doc = { name: "Red", town: "kanto" };
     const result = await collection.insertOne(doc);