feat(isOdd): add isOdd function (#110)

add isOdd function that returns true if a number is Odd and false if its not

Closes #109

Author: diogorighi

src/index.js

@@ -36,8 +36,10 @@ import endsWith from './endsWith'
 import round from './round'
 import checkPalindrome from './checkPalindrome'
 import isFunction from './is-function'
+import isOdd from './is-odd'
 
 export {
+  isOdd,
   isEven,
   revstring,
   initArray,

src/is-odd.js

@@ -0,0 +1,14 @@
+export default isOdd
+
+/**
+ * Original Source:
+ * https://stackoverflow.com/questions/5016313/how-to-determine-if-a-number-is-odd-in-javascript
+ *
+ * This method will check if a number is odd or not.
+ *
+ * @param {Number} num - number to check
+ * @return {Boolean} - True if n is odd, false if not
+ */
+function isOdd(num) {
+  return num % 2 !== 0
+}

test/is-odd.test.js

@@ -0,0 +1,16 @@
+import test from 'ava'
+import {isOdd} from '../src'
+
+test('checks if number is odd and returns true', t => {
+  const n = 27
+  const expected = true
+  const actual = isOdd(n)
+  t.deepEqual(actual, expected)
+})
+
+test('checks if number is odd and returns false', t => {
+  const n = 26
+  const expected = false
+  const actual = isOdd(n)
+  t.deepEqual(actual, expected)
+})