Update README.md

Author: rachleona

README.md

@@ -746,7 +746,7 @@ const encrypted = 65 + (char + key) % 65 % 26
 Additional functionality can be added by allowing the argument to be an array of keys:
 
 ```js
-const allShifts = [...Array(26).keys()]
+const allShifts = [...Array(25).keys()].map( n => n + 1 )
 const cipher = (str, keys=allShifts) => {
  ...
  const res = keys.map( key => {
@@ -759,6 +759,8 @@ Putting it all together:
 
 ```js
 const allShifts = [...Array(26).keys()]
+
+// return all possible shifts if keys not given
 const cipher = (str, keys=allShifts) => {
  const chars = str.split("")
  const res = keys.map( key => {
@@ -780,9 +782,29 @@ const cipher = (str, keys=allShifts) => {
  })
  return res.map( (r, i) => { return { key: keys[i], result: r.join("") } } )
 }
+
+cipher("JavaScript", [1, 2, 27]) 
+/*[{ key: 1, result: 'KbwbTdsjqu' },
+ { key: 2, result: 'LcxcUetkrv' },
+ { key: 27, result: 'KbwbTdsjqu' }]*/
+ 
+cipher("Something")
+/*[{ key: 1, result: 'Tpnfuijoh' },
+ { key: 2, result: 'Uqogvjkpi' },
+ { key: 3, result: 'Vrphwklqj' },
+ { key: 4, result: 'Wsqixlmrk' },
+ ......,
+ { key: 20, result: 'Migynbcha' },
+ { key: 21, result: 'Njhzocdib' },
+ { key: 22, result: 'Okiapdejc' },
+ { key: 23, result: 'Pljbqefkd' },
+ { key: 24, result: 'Qmkcrfgle' },
+ { key: 25, result: 'Rnldsghmf' }
+]
+*/
 ```
 
-And that's the easiest encryption ever! 
+And that's the easiest encryption ever! Happy Coding!
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