Implement Recursive Map

kleekich · Sep 4, 2018 · f0bab53 · f0bab53
1 parent c832e07
commit f0bab53
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/recursion.js b/src/recursion.js
@@ -198,6 +198,8 @@ var countOccurrence = function(array, value) {
 // 21. Write a recursive version of map.
 // rMap([1,2,3], timesTwo); // [2,4,6]
 var rMap = function(array, callback) {
+	if(array.length === 0) return [];
+	return [callback(array[0])].concat(rMap(array.slice(1),callback));
 };
 
 // 22. Write a function that counts the number of times a key occurs in an object.