Various small fixes on the JavaScript 101 Loops page. Fixes jquery#351.

Author: Markus Amalthea Magnuson

page/javascript-101/loops.md

@@ -5,28 +5,26 @@ source: http://jqfundamentals.com/legacy
 attribution:
   - jQuery Fundamentals
 ---
+
 Loops let a block of code run a certain number of times:
 
 ```
-// A for loop
-// logs "try 0", "try 1", ..., "try 4"
 for ( var i = 0; i < 5; i++ ) {
-
+	// Logs "try 0", "try 1", ..., "try 4".
 	console.log( "try " + i );
-
 }
 ```
 
-Note that in loops, the variable i is not "scoped" to the loop block even though the keyword `var` is used before the variable name. Scope is covered in more depth in the [Scope](/scope/) section.
+Note that in loops, the variable `i` is not "scoped" to the loop block even though the keyword `var` is used before the variable name. Scope is covered in more depth in the [Scope](/scope/) section.
 
-## The `for` loop
+## The `for` Loop
 
 A `for` loop is made up of four statements and has the following structure:
 
 ```
 for ( [initialisation]; [conditional]; [iteration] ) {
 
-	[ loopBody ]
+	[loopBody]
 
 }
 ```
@@ -37,22 +35,21 @@ The _conditional_ statement is executed before each iteration, and its return va
 
 The _iteration_ statement is executed at the end of each iteration and gives you an opportunity to change the state of important variables. Typically, this will involve incrementing or decrementing a counter and thus bringing the loop closer to its end.
 
-The _loopBody_ statement is what runs on every iteration. It can contain anything. Typically, there will be multiple statements that need to be executed, and should be wrapped in a block ( {...} ).
+The _loopBody_ statement is what runs on every iteration. It can contain anything. Typically, there will be multiple statements that need to be executed, and should be wrapped in a block (`{...}`).
 
 Here's a typical `for` loop:
 
 ```
-// A typical for loop
 for (var i = 0, limit = 100; i < limit; i++) {
-	// This block will be executed 100 times
-	console.log( 'Currently at ' + i );
-	// Note: the last log will be "Currently at 99"
+	// This block will be executed 100 times.
+	console.log( "Currently at " + i );
+	// Note: The last log will be "Currently at 99".
 }
 ```
 
 ## The `while` loop
 
-A while loop is similar to an `if` statement, except that its body will keep executing until the condition evaluates to false.
+A while loop is similar to an `if` statement, except that its body will keep executing until the condition evaluates to a falsy value.
 
 ```
 while ( [conditional] ) {
@@ -65,45 +62,41 @@ while ( [conditional] ) {
 Here's a typical `while` loop:
 
 ```
-// A typical while loop
 var i = 0;
 while ( i < 100 ) {
-	// This block will be executed 100 times
+	// This block will be executed 100 times.
 	console.log( "Currently at " + i );
-
-	// increment i
-	i++;
+	i++; // Increment i
 }
 ```
 
 Notice that the counter is incrementing within the loop's body. It's possible to combine the conditional and incrementer, like so:
 
 ```
-// A while loop with a combined conditional and incrementer
 var i = -1;
 while ( ++i < 100 ) {
-	// This block will be executed 100 times
+	// This block will be executed 100 times.
 	console.log( "Currently at " + i );
 }
 ```
 
-Notice that the counter starts at -1 and uses the prefix incrementer (++i).
+Notice that the counter starts at -1 and uses the prefix incrementer (`++i`).
 
-## The `do-while` loop
+## The `do-while` Loop
 
 This is almost exactly the same as the `while` loop, except for the fact that the loop's body is executed at least once before the condition is tested.
 
 ```
 do {
 
-	[ loopBody ]
+	[loopBody]
 
 } while ( [conditional] )
 ```
+
 Here's a `do-while` loop:
 
 ```
-// A do-while loop
 do {
 	// Even though the condition evaluates to false
 	// this loop's body will still execute once.
@@ -114,9 +107,9 @@ do {
 
 These types of loops are quite rare since only few situations require a loop that blindly executes at least once. Regardless, it's good to be aware of it.
 
-## Breaking and continuing
+## Breaking and Continuing
 
-Usually, a loop's termination will result from the conditional statement not evaluating to true, but it is possible to stop a loop in its tracks from within the loop's body with the `break` statement.
+Usually, a loop's termination will result from the conditional statement not evaluating to a truthy value, but it is possible to stop a loop in its tracks from within the loop's body with the `break` statement:
 
 ```
 // Stopping a loop
@@ -127,7 +120,7 @@ for ( var i = 0; i < 10; i++ ) {
 }
 ```
 
-You may also want to continue the loop without executing more of the loop's body. This is done using the `continue` statement.
+You may also want to continue the loop without executing more of the loop's body. This is done using the `continue` statement:
 
 ```
 // Skipping to the next iteration of a loop
@@ -137,7 +130,7 @@ for ( var i = 0; i < 10; i++ ) {
 	}
 
 	// The following statement will only be executed
-	// if the conditional 'something' has not been met
+	// if the conditional "something" has not been met
 	console.log( "I have been reached" );
 
 }