• Has math-related properties and methods
• Properties and Methods
• Examples
  • Math.PI
  • Math.abs()
  • Math.cos(), ...
  • Math.floor(), Math.ceil(), Math.round()
  • Math.random()

• Includes properties and methods for manipulating strings
• String objects are created whenever string objects are declared but also when a variable is set equal to a string.
  • var s = new String()
  • var s1 = new String("hi")
  • var s2 = "jobob"
• Properties and Methods
• Examples for a String named s:
  • s.length
  • s = s.toUpperCase()
  • s.charAt()
  • s.substring(startChar, endChar), s.substr(startChar, NumChars)
  • s.replace( x,y)

• Includes methods and properties for manipulating dates and times
• Date objects are created like other objects but can specify date and/or time
  • var d = new Date()
  • var dd = new Date(2005, 6,4)
  • var ddd = new Date("October 23, 2003 12:34:00")
• Properties and Methods
• Examples for a date named d
  • d.setYear(), d.setMonth(),...
  • d.getYear(), d.getMonth()

• parseInt("arg") returns arg as an integer if it can
• parseFloat("arg") returns arg as a float if it can
• eval("arg") returns arg as an object
• isNaN("arg") returns true if "arg" is Not a Number

1. Write a function that accepts a number in degrees and returns the sin of the angle. Note that you must convert degrees to radians by multiplying degrees by PI and dividing by 180.

2. Write code to demonstrate the difference between ceil(), floor(), and round().

3. Create a page with two textboxes and a button. When the user clicks the button, the contents of the textboxes are checked to make sure that they are numbers. If they are both numbers, then they should be added as numbers and the result should be displayed.

4. Write a function that accepts a string and displays each letter in an alert, one at a time.

5. Write a function that accepts a string and returns it with all of the numbers removed.

6. Create a function that displays the time in the status bar. Only the hours and minutes should be displayed.