在JavaScript中将递归函数转换为箭头函数

Question

How can i convert following function to arrow function? I am using currying here

function mergeString(str){
   return function(str1){
     if(str1){
        return mergeString(str + ' ' + str1); 
     }
     else
     {
       return str;
     }
   }
}

Answer 1

You could chain the function heads and then the function body for all.

 const mergeString = str => str1 => str1 ? mergeString(str + ' ' + str1) : str; console.log(mergeString('a')()); console.log(mergeString('a')('b')('c')()); console.log(mergeString('this')('should')('work')('as')('well')()); 

Answer 2

Actuall this is a good usecase for rest parameters:

 const mergeStrings = (...strings) => strings.join(" ");

Usable as:

mergeString(
  "one",
  "two",
  "three"
)