Chain Adding Function

ChainAddingFunction.js

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+// https://www.codewars.com/kata/a-chain-adding-function/
+
+// We want to create a function that will add numbers together when called in succession.
+
+// add(1)(2);
+// // returns 3
+// We also want to be able to continue to add numbers to our chain.
+
+// add(1)(2)(3); // 6
+// add(1)(2)(3)(4); // 10
+// add(1)(2)(3)(4)(5); // 15
+// and so on.
+
+// A single call should return the number passed in.
+
+// add(1); // 1
+// We should be able to store the returned values and reuse them.
+
+// var addTwo = add(2);
+// addTwo; // 2
+// addTwo + 5; // 7
+// addTwo(3); // 5
+// addTwo(3)(5); // 10
+// We can assume any number being passed in will be valid whole number.
+
+function add(n){
+  const sum = function (y) {
+      return add(n + y);
+  };
+
+  sum.valueOf = function () {
+      return n;
+  };
+
+  return sum;
+}