number (primitive)

• number literals can be written with or without the decimal point
• small or large number literals can be written in pseudo-scientific form
• number can go from 0 to ±1.79769e+308. € 5e-324 is the smallest infinitessimal you can get, anything smaller is rounded to 0.
• number literals can be written in,
  • base 10 (digits 0-9, no leading 0)
  • base 8 (digits 0-7, leading 0)
  • base 16 (digits 0-9,A-Z, leading 0x)
• Conversions
  • String to Integer: parseInt(string [,base])
  • String to floating point: parseFloat(string)
  • number to String: toString()
• Arithmetic Operators

Exercise

Types. JavaScript offers users six possible data types to work with: 5 primitive types and 1 object type.

• undefined
• null
• boolean
• number
• string

Exercises

Input/Output Options.

Input

• HTML forms
• prompt box (Window Object)
• confirm box (Window Object))

Output

• alert box (Window Object)
• document.write( )
• console.log( )