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unit_03/w08d02/homework/README.md

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+# CAESAR CIPHER
+
+### Angular js basics
+
+
+## APP
+
+Make a Caesar Cipher page that takes an input and encodes it with a Caesar Cipher and and displays the encoded input while the user is typing. (no submit button).
+
+Also make it so the user can decode an encoded message.
+
+
+![page](cipherpage.png)
+
+
+### ANGULAR DIRECTIVES
+
+- `ng-keyup`
+- `ng-model`
+
+
+### CAESAR CIPHER
+
+https://en.wikipedia.org/wiki/Caesar_cipher
+
+You can put this Caesar Cipher code in a separate js file (before your main `app.js`), and then reference the `caesarShift` function in your angular controller.
+
+In the example in the above image, the `amount` is set to `12` for encoding, and `-12` for decoding.
+
+```
+var caesarShift = function(str, amount) {
+
+	// Wrap the amount
+	if (amount < 0)
+		return caesarShift(str, amount + 26);
+
+	// Make an output variable
+	var output = '';
+
+	// Go through each character
+	for (var i = 0; i < str.length; i ++) {
+
+		// Get the character we'll be appending
+		var c = str[i];
+
+		// If it's a letter...
+		if (c.match(/[a-z]/i)) {
+
+			// Get its code
+			var code = str.charCodeAt(i);
+
+			// Uppercase letters
+			if ((code >= 65) && (code <= 90))
+				c = String.fromCharCode(((code - 65 + amount) % 26) + 65);
+
+			// Lowercase letters
+			else if ((code >= 97) && (code <= 122))
+				c = String.fromCharCode(((code - 97 + amount) % 26) + 97);
+
+		}
+
+		// Append
+		output += c;
+
+	}
+
+	// All done!
+	return output;
+
+};
+```