#set document(title: "8.6 Chapter summary", author: "OpenStax / XYZ Homework")
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== 8.6#h(0.6em)Chapter summary


  Highlights from this chapter include:


  - A string is a sequence of characters.
- Logical operators can be used to compare two string values. String comparison is done by comparing corresponding ASCII values of characters in the order of appearance in the string.
- String indexing is used to access a character or a sequence of characters in the string.
- String objects are immutable.
- String splicing.


  At this point, you should be able to write programs dealing with string values.


  #figure(table(
  columns: 2, align: left, inset: 6pt,
  table.header([Method], [Description]),
  [len()], [Returns the string length.],
  [upper()], [Returns uppercase characters.],
  [lower()], [Returns lowercase characters.],
  [count()], [Returns the number of a given substring in a string.],
  [find()], [Returns the index of the first occurrence of a given substring in a string. If the substring does not exist in the string, -1 is returned.],
  [index()], [Returns the index of the first occurrence of a given substring in a string. If the substring does not exist in the string, a ValueError is returned.],
  [format()], [Used to create strings with specified patterns using arguments.],
  [join()], [Takes a list of string values and combines string values into one string by placing a given separator between values.],
  [split()], [Separates a string into tokens based on a given separator string. If no separator string is provided, blank space characters are used as separators.],
  [#strong[Operator]], [#strong[Description]],
  [in], [Checks if a substring exists in a string.],
  [in operator in a for loop], [for character in string:
      \# loop body],
))