... immutable - variable 不变的 immutable object 不可变对象 immutable law of business 事务上不易之法则 ...
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Often a variable is only assigned to once and is used as an (immutable) definition.
通常对变量的赋值只有一次,并被当作不变的对象。
An immutable "variable" is declared with the keyword val (think value object).
一个不变的“变量”可以用val关键字来声明(想象一个值对象)。
Scala allows you to decide whether a variable is immutable (read-only) or not (read-write) when you declare it.
当你声明一个变量的时候,Scala允许你来决定它是不变的(只读的)还是可变的(可读写的)。
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