JavaScript - Strings

• A sequence of zero or more Unicode characters enclosed by single or double quotations
• JavaScript strings (and arrays) are indexed from zero (0)
• Integer to String Conversion
  • parseInt(string, radix)
  • A function which accepts a string and returns an integer in the specified base.
  • Radix (e.g. base) is an optional parameter. Valid values are from 2-36. It defaults to 10.
  • Only the first number of the string is returned
  • Leading and trailing spaces are ignored
  • If the 1st character cannot be converted to a number, NaN is returned
• Concatenation
  • Built into the core JavaScript language is the ability to concatenate strings via the + operator

    var s = "Hello" + " World"

• Length
  • To determine the length of a string, use the length() method of the String class

    var len_x = x.length();

• Substrings
  • To extract a substring, use the substring() method of the String class

    var s1 = x.substring(1,5);

  • To find the position of the first occurance of a substring use the indexOf() method of the String class

    var pos = indexOf('W');

• Unlike other languages if the backslash is followed by any character other than the ones noted in the above table, it's simply ignored
• Escape Sequences

  Sequence	Interpretation
  \0	NULL character
  \b	Backspace
  \t	Tab
  \n	Newline
  \v	Vertical tab
  \f	Form Feed
  \r	Carriage Return
  \"	Double Quote
  \'	Single Quote
  \\	Backslash
  \xXX	Latin-1 character specified by hexadecimal # XX
  \uXXXX	Unicode character specified by XXXX