Various small fixes on the JavaScript 101 Conditional Code page. Fixes jquery#350.

Author: Markus Amalthea Magnuson

page/javascript-101/conditional-code.md

@@ -5,32 +5,30 @@ source: http://jqfundamentals.com/legacy
 attribution:
   - jQuery Fundamentals
 ---
+
 Sometimes a block of code should only be run under certain conditions. Flow control – via `if` and `else` blocks – lets you run code if certain conditions have been met.
 
 ```
 // Flow control
+
 var foo = true;
 var bar = false;
 
 if ( bar ) {
-	// this code will never run
+	// This code will never run.
 	console.log( "hello!" );
 }
 
 if ( bar ) {
 
-	// this code won't run
+	// This code won't run.
 
 } else {
 
 	if ( foo ) {
-
-		// this code will run
-
+		// This code will run.
 	} else {
-
-		// this code would run if foo and bar were both false
-
+		// This code would run if foo and bar were both false.
 	}
 
 }
@@ -45,31 +43,31 @@ Be mindful not to define functions with the same name multiple times within sepa
 In order to use flow control successfully, it's important to understand which kinds of values are "truthy" and which kinds of values are "falsy." Sometimes, values that seem like they should evaluate one way actually evaluate another.
 
 ```
-// Values that evaluate to true
+// Values that evaluate to true:
 "0";
 "any string";
-[]; // an empty array
-{}; // an empty object
-1;  // any non-zero number
+[]; // An empty array.
+{}; // An empty object.
+1; // Any non-zero number.
 ```
 
 ```
-// Values that evaluate to false
-"";  // an empty string
-NaN; // JavaScript's "not-a-number" variable
+// Values that evaluate to false:
+""; // An empty string.
+NaN; // JavaScript's "not-a-number" variable.
 null;
-undefined; // be careful -- undefined can be redefined!
-0; // the number zero
+undefined; // Be careful -- undefined can be redefined!
+0; // The number zero.
 ```
 
 ## Conditional Variable Assignment with the Ternary Operator
 
 Sometimes a variable should be set depending on some condition. An `if`/`else` statement works, but in many cases the ternary operator is more convenient. The ternary operator tests a condition; if the condition is true, it returns a certain value, otherwise it returns a different value.
 
 The ternary operator:
+
 ```
-// set foo to 1 if bar is true;
-// otherwise, set foo to 0
+// Set foo to 1 if bar is true; otherwise, set foo to 0:
 var foo = bar ? 1 : 0;
 ```
 
@@ -81,6 +79,7 @@ Rather than using a series of `if`/`else` blocks, sometimes it can be useful to
 
 ```
 // A switch statement
+
 switch ( foo ) {
 
 	case "bar":
@@ -122,7 +121,7 @@ if ( stuffToDo[ foo ] ) {
 
 } else {
 
-	stuffToDo["default"]();
+	stuffToDo[ "default" ]();
 
 }
 ```