JS project start

2026-02-04 13:51:54 -05:00
parent 59948ed75c
commit c88c9bbeea
16 changed files with 549442 additions and 14 deletions
@@ -0,0 +1,68 @@
+<html>
+	<head>
+		<title>Sets (Collections)</title>
+		<script language="JavaScript" type="text/JavaScript">
+			// create a Set type
+			var set1 = new Set();
+			
+			// add 2 values to the set
+			set1.add("apple");
+			set1.add("oranges");
+			
+			// return the number of members in the set
+			console.log(set1.size); // 2
+
+			// add a new member and then try to add it again
+			set1.add("banana");
+			set1.add("banana"); // ignored
+
+			// get the set size again
+			console.log(set1.size); // 3
+
+			// remove (delete) a member
+			set1.delete("banana");
+
+			// get the size again
+			console.log(set1.size); // 2
+
+			// determine if particular values are members or not
+			console.log(set1.has("banana")); // false
+			console.log(set1.has("apple")); // true
+
+			// the forEach() method calls a provided function once for each element in a set, in order.
+			// using anonymous function
+			set1.forEach(function(value) {
+			  console.log(value);
+			});
+			
+			// using a declared function
+			set1.forEach(loopFor);
+			
+			function loopFor(value) {
+				console.log(value);
+			}
+
+			// convert the set to an array
+			var arr = [...set1]; // spread syntax
+			console.log(arr[1]); // oranges 
+
+			// create a new set from an array literal
+			var set2 = new Set(['one','two','three']);
+			
+			// get the size of the new set
+			console.log(set2.size); // 3
+
+			// same as above but with an array variable
+			var arr2 = ['test','again'];
+			var set3 = new Set(arr2);
+			console.log(set3.size); // 2
+
+			// remove all members from the set
+			set1.clear(); 
+			console.log(set1.size); // 0 
+		</script>
+	</head>
+	<body>
+	
+	</body>
+</html>