feat: add square function (#65)

* square function

* retry

Author: shubham808

src/index.js

@@ -17,6 +17,7 @@ import add from './add'
 import subtract from './subtract'
 import divide from './divide'
 import multiply from './multiply'
+import square from './square'
 
 export {
   flatten,
@@ -38,4 +39,5 @@ export {
   subtract,
   divide,
   multiply,
+  square,
 }

src/square.js

@@ -0,0 +1,11 @@
+export default square
+
+/**
+ * This method will perform square of a number.
+ *
+ * @param {Number} num1 - number
+ * @return {Number} - Result of square of a number
+ */
+function square(num1) {
+  return num1 * num1
+}

test/square.test.js

@@ -0,0 +1,9 @@
+import test from 'ava'
+import {square} from '../src'
+
+test('Square a number ', t => {
+  const number = 3
+  const expected = 3 * 3
+  const actual = square(number)
+  t.deepEqual(actual, expected)
+})