diff --git a/challenge.js b/challenge.js
new file mode 100644
index 0000000..b7164cd
--- /dev/null
+++ b/challenge.js
@@ -0,0 +1,9 @@
+const challenge = (array) => {
+  let number = 0;
+  while(array.length !== 0){
+    number = array.shift()
+    if(number + 1 !== array[0])
+      break;
+  }
+  return number + 1;
+}
diff --git a/lesson2/sol.js b/lesson2/sol.js
new file mode 100644
index 0000000..1464913
--- /dev/null
+++ b/lesson2/sol.js
@@ -0,0 +1,5 @@
+const add = (a,b) => {
+  return a+b;
+}
+
+module.exports = add;
diff --git a/lesson2/testSol.js b/lesson2/testSol.js
new file mode 100644
index 0000000..e307582
--- /dev/null
+++ b/lesson2/testSol.js
@@ -0,0 +1,9 @@
+const addFunction = require('./sol.js');
+
+const test = (a,b,c) => {
+  addFunction(a,b) === c ? console.log('Correct') : console.log('Wrong')
+}
+
+test(2,2,4);
+test(2,6,8);
+test(-1,-1,-2);