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 specify the...
    2025-10-25 13:35:16 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 to pa...
    2025-10-25 13:35:13 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 function. I...
    2025-10-25 13:35:16 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 function, o...
    2025-10-25 13:35:11 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 function is...
    2025-10-25 13:35:17 UTC
  • 8.22. Scala recursive function

    Recursive functions play an important role in functional programming languages. Scala also supports recursive functions. ...
    2025-10-25 13:35:11 UTC
  • 8.23. Scala higher order function

    Higher-Order Function are functions that operate onother functions. Higher-order functions are allowed in Scala, and highe...
    2025-10-25 13:35:16 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 and the...
    2025-10-25 13:35:15 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 accept...
    2025-10-25 13:35:15 UTC
  • 8.26. Scala closure

    A closure is a function and the return value depends on one or more variables declared outside the function. Generally spe...
    2025-10-25 13:35:10 UTC
  • 8.27. Scala string

    The following example assigns a string to a constant: 8.27.1. Example # object Test { val greeting: String = "Hell...
    2025-10-25 13:35:15 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 of the ...
    2025-10-25 13:35:14 UTC
  • 8.29. Scala Collection

    Scala provides a good set of collection implementations, providing some abstractions of collection types. Scala collection...
    2025-10-25 13:35:14 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 immutable...
    2025-10-25 13:35:15 UTC
  • 8.31. Scala Set

    Scala set (collection) is a collection of objects without repetition, and all elements are unique. Scala collections a...
    2025-10-25 13:35:13 UTC
  • 8.32. Scala Mapping

    mapping is an iterative key-value pair (key/value) structure. All values can be obtained by key. The keys in Map are...
    2025-10-25 13:35:11 UTC
《地理信息系统原理、技术与方法》  97

最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。