Add labeled statements

codes/LabeledStatements.swift

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+// Labeled Statements
+// 
+// In Swift, you can nest loops and conditional statements inside other 
+// loops and conditional statements to create complex control flow structures.
+// However, loops and conditional statements can both use the break statement
+// to end their execution prematurely. Therefore, it is sometimes useful to be
+// explicit about which loop or conditional statement you want a break statement
+// to terminate. Similarly, if you have multiple nested loops, it can be useful
+// to be explicit about which loop the continue statement should affect.
+
+// To achieve these aims, you can mark a loop statement or conditional statement
+// with a statement label. With a conditional statement, you can use a statement
+// label with the break statement to end the execution of the labeled statement.
+// With a loop statement, you can use a statement label with the break or
+// continue statement to end or continue the execution of the labeled statement.
+
+// A labeled statement is indicated by placing a label on the same line as the
+// statement’s introducer keyword, followed by a colon.
+
+// Here’s an example of this syntax for a for loop, although the principle is
+// the same for all loops and switch statements:
+
+loopLabel: for i in 1...10 {
+	for j in 1...10 {
+		let product = i * j
+		print("Product is \(product)")
+		break loopLabel
+	}
+}
+
+// prints: Product is 1