8. Scala

  • 8.17. Scala function-variable argument

    Scala allows you to specify that the last argument to the function can be duplicated, that is, we do not need to speci...
    2023-11-14 23:00:02 UTC
  • 8.18. Scala function-default parameter value

    Scala can specify the default parameter value for the function parameter, using the default parameter, you do not need...
    2023-11-15 23:00:02 UTC
  • 8.19. Scala function nesting

    We can define the function in the Scala function, and the function defined in the function is called the local functio...
    2023-11-15 23:00:02 UTC
  • 8.20. Scala partial application function

    Scala partial application function is an expression, you do not need to provide all the parameters needed by the funct...
    2023-11-15 23:00:02 UTC
  • 8.21. Scala specifies the function parameter name

    In general, the function call parameters are passed one by one according to the order of the parameters when the funct...
    2023-11-15 23:00:02 UTC
  • 8.22. Scala recursive function

    Recursive functions play an important role in functional programming languages. Scala also supports recursive...
    2023-11-15 23:00:02 UTC
  • 8.23. Scala higher order function

    Higher-Order Function are functions that operate onother functions. Higher-order functions are allowed in Sca...
    2023-11-16 23:00:02 UTC
  • 8.24. Scala anonymous function

    The syntax for defining anonymous functions in Scala is simple, with the argument list on the left side of the arrow a...
    2023-11-16 23:00:02 UTC
  • 8.25. Scala function Corialization (Currying)

    Currying refers to the process of changing a function that originally accepts two parameters into a new function that ...
    2023-11-17 23:00:02 UTC
  • 8.26. Scala closure

    A closure is a function and the return value depends on one or more variables declared outside the function. ...
    2023-11-16 23:00:02 UTC
  • 8.27. Scala string

    The following example assigns a string to a constant: 8.27.1. Example # ...
    2023-11-16 23:00:02 UTC
  • 8.28. Scala array

    The array provided in the Scala language is used to store fixed-size elements of the same type, and the array is one o...
    2023-12-11 00:55:01 UTC
  • 8.29. Scala Collection

    Scala provides a good set of collection implementations, providing some abstractions of collection types. Sca...
    2023-11-17 23:00:02 UTC
  • 8.30. Scala List

    Scala lists are similar to arrays in that all elements are of the same type,but they are also different: lists are imm...
    2023-11-20 23:00:02 UTC
  • 8.31. Scala Set

    Scala set (collection) is a collection of objects without repetition, and all elements are u...
    2023-11-20 23:00:02 UTC
  • 8.32. Scala Mapping

    mapping is an iterative key-value pair (key/value) structure. All values can be obtained by key. The...
    2023-11-20 23:00:02 UTC
Principles, Technologies, and Methods of Geographic Information Systems  102

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.