1. JavaScript Loops

2. Looping Want to be able to do things more than once Basic: for (var i=initial; while-clause; increment) { statement; }

3. Looping through an array Attribute of an array: length Because first entry is 0, loop while < length

4. Nesting Loops When you need to work with two or more numbers Examples Creating a table Computing area of a range of rectangles …

5. While Want to end the loop based on some condition Need to be changing something to cause it to end Test first: while (condition) { statements; } Test last: do { statements; } while (condition);

6. onload

7. Using JavaScript to create content No user input Comes up when page LOADS

8. JavaScript Strings

9. JavaScripts Strings Easier  Length: stringname.length  Functions: stringname.function()  Concatenation: + or stringname.concat()  Lots more functions  Use of negative index to come from end  Built-in regular expressions Excellent summary

10. Useful Functions charAt()Character at the position indexOf()Position of the first found occurrence lastIndexOf()Position of the last found occurrence replace()Replaces the matched substring with a new substring search()Position of the match split()Splits a string into an array of substrings substr()Substring from start position for number of chars substring()Substring from position 1 to position 2 toLowerCase()Converts a string to lowercase letters toUpperCase()Converts a string to uppercase letters trim()Removes whitespace from both ends of a string