Added Caesar Cipher to readme.md

aesher9o1 · aesher9o1 · commit aa6451498665 · 2019-10-10T22:54:28.000+05:30
diff --git a/README.md b/README.md
@@ -134,7 +134,8 @@ a set of rules that precisely define a sequence of operations.
   * `A` [Strongly Connected Components](src/algorithms/graph/strongly-connected-components) - Kosaraju's algorithm
   * `A` [Travelling Salesman Problem](src/algorithms/graph/travelling-salesman) - shortest possible route that visits each city and returns to the origin city
 * **Cryptography**
-  * `B` [Polynomial Hash](src/algorithms/cryptography/polynomial-hash) - rolling hash function based on polynomial
+  * `B` [Polynomial Hash](src/algorithms/cryptography/polynomial-hash) - rolling hash function 
+  * `B` [Caesar Cipher](src/algorithms/cryptography/caesar-cipher) - caesar-cipher
 * **Uncategorized**
   * `B` [Tower of Hanoi](src/algorithms/uncategorized/hanoi-tower)
   * `B` [Square Matrix Rotation](src/algorithms/uncategorized/square-matrix-rotation) - in-place algorithm
diff --git a/src/algorithms/cryptography/caesar-cipher/CaesarCipher.js b/src/algorithms/cryptography/caesar-cipher/CaesarCipher.js
@@ -14,7 +14,7 @@ export default class CaesarCipher {
     }
 
     let output = '';
-    for (let i = 0; i < word.length; i + 1) {
+    for (let i = 0; i < word.length; i += 1) {
       let c = word[i];
       if (c.match(/[a-z]/i)) {
         const code = word.charCodeAt(i);
diff --git a/src/algorithms/cryptography/caesar-cipher/README.md b/src/algorithms/cryptography/caesar-cipher/README.md
@@ -11,7 +11,5 @@ Where x is the text to be encrypted/decrypted and k is the private key or the am
 
 ## References
 
-- [Where to Use Polynomial String Hashing](https://www.mii.lt/olympiads_in_informatics/pdf/INFOL119.pdf)
-- [Hashing on uTexas](https://www.cs.utexas.edu/~mitra/csSpring2017/cs313/lectures/hash.html)
-- [Hash Function on Wikipedia](https://en.wikipedia.org/wiki/Hash_function)
-- [Rolling Hash on Wikipedia](https://en.wikipedia.org/wiki/Rolling_hash)
+- [Ceasar Cipher](http://practicalcryptography.com/ciphers/caesar-cipher/)
+
diff --git a/src/algorithms/cryptography/caesar-cipher/__test__/CaesarCipher.test.js b/src/algorithms/cryptography/caesar-cipher/__test__/CaesarCipher.test.js
@@ -1,12 +1,10 @@
 import CaesarCipher from '../CaesarCipher';
 
 describe('ceasarCipher', () => {
-  it('shifts the character by a particular amount as specified by the user', () => {
+  it('ciphers and decyphers the text', () => {
     const cipher = new CaesarCipher();
-    const encText = cipher.encrypt('ABC', 3);
-    const decText = cipher.decrypt('DEF', 3);
 
-    expect(encText).toEqual('XYZ');
-    expect(decText).toEqual('ABC');
+    expect(cipher.encrypt('ABC', 3)).toBe('DEF');
+    expect(cipher.decrypt('DEF', 3)).toBe('ABC');
   });
 });

Original file line number	Diff line number	Diff line change
`@@ -14,7 +14,7 @@ export default class CaesarCipher {`
`14`	`14`	`}`
`15`	`15`
`16`	`16`	`let output = '';`
`17`		`- for (let i = 0; i < word.length; i + 1) {`
	`17`	`+ for (let i = 0; i < word.length; i += 1) {`
`18`	`18`	`let c = word[i];`
`19`	`19`	`if (c.match(/[a-z]/i)) {`
`20`	`20`	`const code = word.charCodeAt(i);`