Scala 中的 = 和 := 有什么区别? [英] What is the difference between = and := in Scala?
问题描述
= 和 := 在 Scala 中有什么区别?
What is the difference between = and := in Scala?
我在谷歌上广泛搜索了scala Colon-equals"，但找不到任何明确的内容.
I have googled extensively for "scala colon-equals", but was unable to find anything definitive.
推荐答案
= 在 scala 中是实际的赋值操作符——它做了一些特定的事情，在大多数情况下你不会有控制权，例如
= in scala is the actual assignment operator -- it does a handful of specific things that for the most part you don't have control over, such as
- 在创建时给
val或var一个值 - 更改
var 的值 - 更改类中字段的值
- 创建类型别名
- 可能是其他人
:= 不是内置运算符——任何人都可以重载它并将其定义为任何他们喜欢的意思.人们喜欢使用 := 的原因是因为它看起来很赋值，在其他语言中被用作赋值运算符.
:= is not a built-in operator -- anyone can overload it and define it to mean whatever they like. The reason people like to use := is because it looks very assignmenty and is used as an assignment operator in other languages.
因此，如果您想了解 := 在您正在使用的特定库中的含义……我的建议是查看 Scaladocs(如果存在)以查找方法名为 :=.
So, if you're trying to find out what := means in the particular library you're using... my advice is look through the Scaladocs (if they exist) for a method named :=.
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