1. Loops
Kevin Harville

2. for loops Loop, through the braced code starting with myVar at 1.
for (myVar = 1; myVar<=10; myVar + 2){
alert(myVar) }
Loop, through the braced code starting with myVar at 1.
Continue as long as myVar is <= 10
Increment by 2

3. while loops while (condition == true){ alert("True");
//maybe the condition changes }
While loops repeat as long as the condition remains true.

4. while loops //previous statements … while (condition == true){
alert("True"); }
//subsequent statements…
The loop would be passed over if the condition were never true--Just like an if statement.

5. do while loops do { alert("True") //maybe the condition changes
} while (condition == true);
When the program reaches this point, the loop would execute at least once. The condition is at the end of the loop.

6. Breaking out while (condition == true){ alert("True");
if (tired == true) break; }
//subsequent lines
While loops repeat as long as the condition remains true….unless we break out of the loop.
For loops repeat their iterations* as scheduled until a break is reached.
*Iteration: Geekspeak for times.

7. continue var x = 5; while (x < 10) { x++; if (x == 7) continue;
document.write(x + "<BR>"); }
Continue continues on with the next iteration of the loop.

8. for … in loops
Similar to the previous but cycle through all properties of an object.
Know they exist. They are handy, particularly for debugging.
for (i in document) {
document.write("<p>" + i ="<br>");
document.write(document[i]); }

9. Loops and Arrays Loops are very often used with arrays.
Remember, arrays are objects that consist of several subscripted variables:
myArray = new Array();
myArray[0] = 24
myArray[1]= 12
myArray[2] = 4

10. Looping through an Array
for (i=0; i <= 2; i++) {
alert(myArray[i]) }

11. Putting it all together:
myArray = new Array();
myArray[0] = 24
myArray[1]= 12
myArray[2] = 4
for (i=0; i <= 2; i++) {
alert(myArray[i]) }

12. Summary of Loops for loop while loop do / while loop
for / in loop for use with object properties
break finishes the loop altogether
continue goes directly to the next iteration
Much can be accomplished with arrays and loops