davidngu3
diff --git a/‎caesar/caesar.js
Lines changed: 23 additions & 5 deletions b/‎caesar/caesar.js
Lines changed: 23 additions & 5 deletions
diff --git a/‎caesar/caesar.spec.js
Lines changed: 6 additions & 6 deletions b/‎caesar/caesar.spec.js
Lines changed: 6 additions & 6 deletions
@@ -1,5 +1,23 @@
-const caesar = function() {
-
-}
-
-module.exports = caesar
+const caesar = function(string, shift) {
+    return string
+      .split("")
+      .map(char => shiftChar(char, shift))
+      .join("");
+  };
+  
+  const codeSet = code => (code < 97 ? 65 : 97);
+  
+  const mod = (n, m) => (n % m + m) % m;
+  
+  const shiftChar = (char, shift) => {
+    const code = char.charCodeAt();
+  
+    if ((code >= 65 && code <= 90) || (code >= 97 && code <= 122)) {
+      return String.fromCharCode(
+        mod(code + shift - codeSet(code), 26) + codeSet(code)
+      );
+    }
+    return char;
+  };
+  
+  module.exports = caesar;
@@ -4,22 +4,22 @@ describe('caesar', function() {
   it('works with single letters', function() {
     expect(caesar('A', 1)).toEqual('B');
   });
-  xit('works with words', function() {
+  it('works with words', function() {
     expect(caesar('Aaa', 1)).toEqual('Bbb');
   });
-  xit('works with phrases', function() {
+  it('works with phrases', function() {
     expect(caesar('Hello, World!', 5)).toEqual('Mjqqt, Btwqi!');
   });
-  xit('works with negative shift', function() {
+  it('works with negative shift', function() {
     expect(caesar('Mjqqt, Btwqi!', -5)).toEqual('Hello, World!');
   });
-  xit('wraps', function() {
+  it('wraps', function() {
     expect(caesar('Z', 1)).toEqual('A');
   });
-  xit('works with large shift factors', function() {
+  it('works with large shift factors', function() {
     expect(caesar('Hello, World!', 75)).toEqual('Ebiil, Tloia!');
   });
-  xit('works with large negative shift factors', function() {
+  it('works with large negative shift factors', function() {
     expect(caesar('Hello, World!', -29)).toEqual('Ebiil, Tloia!');
   });
 });