feat: add a feature to find square roots (#84)

a new feature/function which help to calculate the square root of any number given as input to it

Closes #83

Author: sinahwz

src/index.js

@@ -25,6 +25,7 @@ import square from './square'
 import sum from './sum'
 import dec2bin from './dec2bin'
 import searchAndReplace from './search-and-replace'
+import sqrt from './sqrt'
 
 export {
   initArray,
@@ -53,4 +54,5 @@ export {
   sum,
   dec2bin,
   searchAndReplace,
+  sqrt,
 }

src/sqrt.js

@@ -0,0 +1,12 @@
+export default sqrt
+
+/**
+ * This method will perform square root operation.
+ *
+ * @param {Number} num - number to calculate its square root
+ * @return {Number} - Result of the square root operation
+ */
+
+function sqrt(num) {
+  return Math.sqrt(num)
+}

test/sqrt.test.js

@@ -0,0 +1,10 @@
+import test from 'ava'
+import {sqrt} from '../src'
+
+test('Square root of a number', t => {
+  const number = 25
+  const expected = 5
+  const actual = sqrt(number)
+  t.deepEqual(actual, expected)
+})
+