Adding palindrome solution

solutions/120.js

@@ -0,0 +1,25 @@
+// Natalie Lockhart
+// Determine if array is a palindrome
+
+const solution = (arr) => {
+
+  function palindrome(arr, index){
+    if (index == 0) {
+      return true;
+	}	
+	if (arr[index-1] != arr[arr.length - index]){
+	  return false;
+	}
+	return palindrome(arr, index-1);
+  }
+
+  if (arr.length == 0 || arr.length == 1) {
+      return true;
+  }
+  var index = Math.floor(arr.length/2);
+  return palindrome(arr, index);
+};
+
+module.exports = {
+  solution,
+};

test/120.js

@@ -0,0 +1,29 @@
+const expect = require('chai').expect;
+let solution = require('../solutions/120.js').solution;
+
+describe('palindrome', () => {
+  it('should return true for [1,2,3,4,4,3,2,1]', () => {
+    const result = solution([1,2,3,4,4,3,2,1]);
+	expect(result).to.equal(true);
+  });
+  it('should return true for [10,11,12,11,10]', () => {
+    const result = solution([10,11,12,11,10]);
+	expect(result).to.equal(true);
+  });
+  it('should return true for [1]', () => {
+    const result = solution([1]);
+	expect(result).to.equal(true);
+  });
+  it('should return true for []', () => {
+	const result = solution([]);
+	expect(result).to.equal(true);
+  });
+  it('should return false for [10,11]', () => {
+    const result = solution([10,11]);
+	expect(result).to.equal(false);
+  });
+  it('should return false for [10,11,12])', () => {
+    const result = solution([10,11,12]);
+	expect(result).to.equal(false);
+  });
+});