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问题描述
只是想知道是否有更实用的方法来实现某些功能如下所示:
def expand(exp:String):String = {
var result = exp $ b $ (b)为((k,v)< - libMap){result = result.replace(k,(%s).format(v))}
结果
}
或者一般而言,给定一个字符串和一些可迭代集合,遍历集合并为每个元素增量修改输入字符串。
干杯
解决方案
var result = init
for(foo< - bar){result = f(result,foo)}
结果
可以在功能上表示为
bar.foldLeft(init)(f)
case this becomas:
l ibMap.foldLeft(exp){case(result,(k,v))=> result.replace(k,(%s)。format(v))}
I'm just starting Scala and so getting my head around doing things in a more functional style.
Just wondering if there is a more functional way to achieve something like the following:
def expand(exp: String): String = {
var result = exp
for ((k,v) <- libMap) {result = result.replace(k, "(%s)".format(v))}
result
}
Or in general terms, given a string and some iterable collection, go through the collection and for every element, incrementally modify the input string.
Cheers
解决方案
Generally the pattern
var result = init
for (foo <- bar) { result = f(result, foo)}
result
can be expressed functionally as
bar.foldLeft(init)(f)
So for your case this becomas:
libMap.foldLeft(exp){ case(result, (k,v)) => result.replace(k, "(%s)".format(v))}
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