Lesson 14

nmarvila · nmarvila · commit 47aa0ebc2973 · 2023-10-08T17:55:49.000-03:00
diff --git a/14 - JavaScript References VS Copying/index-START.html b/14 - JavaScript References VS Copying/index-START.html
@@ -9,13 +9,27 @@
 
   <script>
     // start with strings, numbers and booleans
+    // let age = 100;
+    // let age2 = age;
+    // console.log(age, age2);
+    // age = 200;
+    // console.log(age, age2);
+
+    // let name = 'Wes';
+    // let name2 = name;
+    // console.log(name, name2);
+    // name = 'wesley';
+    // console.log(name, name2);
 
     // Let's say we have an array
     const players = ['Wes', 'Sarah', 'Ryan', 'Poppy'];
 
     // and we want to make a copy of it.
+    const team = players;
 
+    console.log(players, team);
     // You might think we can just do something like this:
+    // team[3] = 'Lux';
 
     // however what happens when we update that array?
 
@@ -26,12 +40,19 @@
     // Why? It's because that is an array reference, not an array copy. They both point to the same array!
 
     // So, how do we fix this? We take a copy instead!
+    const team2 = players.slice();
 
     // one way
 
     // or create a new array and concat the old one in
+    const team3 = [].concat(players);
 
     // or use the new ES6 Spread
+    const team4 = [...players];
+    team4[3] = 'heeee hawww';
+    console.log(team4);
+
+    const team5 = Array.from(players);
 
     // now when we update it, the original one isn't changed
 
@@ -44,13 +65,33 @@
     };
 
     // and think we make a copy:
+    // const captain = person;
+    // captain.number = 99;
 
     // how do we take a copy instead?
+    const cap2 = Object.assign({}, person, { number: 99, age: 12 });
+    console.log(cap2);
 
     // We will hopefully soon see the object ...spread
+    const cap3 = {...person};
 
     // Things to note - this is only 1 level deep - both for Arrays and Objects. lodash has a cloneDeep method, but you should think twice before using it.
 
+    const wes = {
+      name: 'Wes',
+      age: 100,
+      social: {
+        twitter: '@wesbos',
+        facebook: 'wesbos.developer'
+      }
+    };
+
+    console.clear();
+    console.log(wes);
+
+    const dev = Object.assign({}, wes);
+    const dev2 = JSON.parse(JSON.stringify(wes));
+
   </script>
 
 </body>
