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问题描述
有人知道我如何在无形状的HMap中添加或修改值吗?我在HMap定义上看到的唯一功能是:
Does anyone know how I might add or modify values in a shapeless HMap? The only functions I see on the HMap definition are:
-
get -
+(看起来正在创建新地图并添加(k,v)元组) -
-(与上面相同)
get+(which looks like it's creating a new map and adding the(k,v)tuple)-(same as above)
我怀疑我需要使用镜头吗?
My suspicion is that I will need to use lens?
推荐答案
shapeless.HMap是不可变的.它是scala.collection.immutable.Map的包装(具有类型级别的增强功能).
shapeless.HMap is immutable. It's a wrapper (with type-level enhancements) of scala.collection.immutable.Map.
+添加或修改一对(返回新的HMap).
+ adds or modifies a pair (returning new HMap).
镜头也会创建一个副本.不变性/持久性是FP的典型特征.
Lenses also create a copy. Immutability/persistence is typical for FP.
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