Added array sorting and new ES6 samples

buckyroberts · buckyroberts · commit cb8447b414d4 · 2016-07-07T09:57:12.000-04:00
diff --git a/Data_Structures/Arrays_New_ES6_1/README.md b/Data_Structures/Arrays_New_ES6_1/README.md
diff --git a/Data_Structures/Arrays_New_ES6_1/main.js b/Data_Structures/Arrays_New_ES6_1/main.js
diff --git a/Data_Structures/Arrays_New_ES6_2/README.md b/Data_Structures/Arrays_New_ES6_2/README.md
@@ -0,0 +1,3 @@
+# Title
+
+Description
diff --git a/Data_Structures/Arrays_New_ES6_2/main.js b/Data_Structures/Arrays_New_ES6_2/main.js
@@ -0,0 +1,19 @@
+"use strict";
+
+let numbers = [2, 4, 7, 9];
+
+// from() creates a new array from an existing one
+let numbers2 = Array.from(numbers);
+console.log(numbers2);
+
+// fill() fills an array with specified value
+let bacon = [1, 2, 3, 4, 5];
+bacon.fill(0);
+console.log(bacon);
+
+// we can pass in the starting index as a second parameter
+let tuna = [1, 2, 3, 4, 5];
+tuna.fill(68, 2);
+console.log(tuna);
+
+
diff --git a/Data_Structures/Arrays_Sorting/README.md b/Data_Structures/Arrays_Sorting/README.md
@@ -0,0 +1,3 @@
+# Title
+
+Description
diff --git a/Data_Structures/Arrays_Sorting/main.js b/Data_Structures/Arrays_Sorting/main.js
@@ -0,0 +1,63 @@
+"use strict";
+
+let items = [1, 10, 17, 18, 2, 7, 3, 19, 14, 5];
+console.log(items.reverse());
+
+// not what we wanted, because it sorts the numbers as if they are all strings
+console.log(items.sort());
+
+console.log('--------------------');
+
+/*
+ * When the sort() method compares two values, it sends the values to the compare function, and sorts the values
+ * according to the returned (negative, zero, positive) value.
+ *
+ * EXAMPLE:
+ * When comparing 40 and 100, the sort() method calls the compare function(40,100)
+ * The function calculates 40-100, and returns -60 (a negative value)
+ * The sort function will sort 40 as a value lower than 100
+ * */
+items.sort(function (a, b) {
+    return a - b;
+});
+console.log(items);
+
+console.log('--------------------');
+
+// reverse sort
+items.sort(function (a, b) {
+    return b - a;
+});
+console.log(items);
+
+console.log('--------------------');
+
+// can also do this
+function compare(a, b) {
+    if (a < b)
+        return -1;
+    if (a > b)
+        return 1;
+    return 0;
+}
+let items2 = [1, 10, 17, 18, 2, 7, 3, 19, 14, 5];
+console.log(items2.sort(compare));
+
+console.log('--------------------');
+
+// custom sorting
+let friends = [
+    {name: 'Bucky', age: 50},
+    {name: 'Sally', age: 40},
+    {name: 'Tommy', age: 70},
+    {name: 'Wendy', age: 20},
+    {name: 'Chris', age: 60}
+];
+function compareAges(a, b){
+    if (a.age < b.age)
+        return -1;
+    if (a.age > b.age)
+        return 1;
+    return 0;
+}
+console.log(friends.sort(compareAges));
