problems(js): add “2632. Curry”

Signed-off-by: Matej Focko <mfocko@redhat.com>

problems/curry.js

@@ -0,0 +1,19 @@
+/**
+ * @param {Function} fn
+ * @return {Function}
+ */
+var curry = function(fn) {
+    return function curried(...args) {
+        if (args.length >= fn.length) {
+            return fn.apply(this, args);
+        }
+
+        return curried.bind(this, ...args);
+    };
+};
+
+/**
+ * function sum(a, b) { return a + b; }
+ * const csum = curry(sum);
+ * csum(1)(2) // 3
+ */