本文介绍了Opa:howo来操纵stringmap(和其他地图)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想创建一个Stringmap,在里面添加一些值,并传递一些函数。我已经尝试过: import stdlib.core.map
mymap = StringMap_empty
mymap [rabbit] = 12
函数addmap(map)
{
map [兔子] = 24
}
但没有编译。我只能使用stringmap通过数据库! ( - >数据库stringmap(int)/ myMap)
我的代码有什么问题?
解决方案
Opa是一种功能性编程语言。您应该阅读此主题了解更多信息:
mymap = StringMap。空
mymap = StringMap.add(rabbit,12,mymap)
//你不能只写StringMap.add(rabbit,12,mymap)
//因为默认值是不可变
//函数返回添加新元素的地图
函数addmap(map)
{
StringMap.add(rabbit,24,map)
}
mymap = addmap(mymap)
I want to create a Stringmap, add some values inside, and pass it some function. I've tried this :
import stdlib.core.map
mymap = StringMap_empty
mymap["rabbit"] = 12
function addmap(map)
{
map["rabbit"] = 24
}
But nothing compile. I can only use stringmap througt database ! (-> database stringmap(int) /myMap )
What's wrong with my code ?
解决方案
Opa is a functional programming language. You should read this thread for more information:Opa: Iterating through stringmap and forming a new string based on it
mymap = StringMap.empty
mymap = StringMap.add("rabbit", 12, mymap)
// you can't just write StringMap.add("rabbit", 12, mymap)
// because values are by default not mutable
// the function returns the map with the new element added
function addmap(map)
{
StringMap.add("rabbit", 24, map)
}
mymap = addmap(mymap)
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