added check for Integer (#1137)

Bit-Manipulation/BinaryCountSetBits.js

@@ -9,6 +9,11 @@
 
 function BinaryCountSetBits (a) {
   'use strict'
+
+  // check whether input is an integer, some non-integer number like, 21.1 have non-terminating binary expansions and hence their binary expansion will contain infinite ones, thus the handling of non-integers (including strings,objects etc. as it is meaningless) has been omitted
+
+  if (!Number.isInteger(a)) throw new TypeError('Argument not an Integer')
+
   // convert number into binary representation and return number of set bits in binary representation
   return a.toString(2).split('1').length - 1
 }

Bit-Manipulation/test/BinaryCountSetBits.test.js

@@ -24,3 +24,9 @@ test('check BinaryCountSetBits of 0 is 0', () => {
   const res = BinaryCountSetBits(0)
   expect(res).toBe(0)
 })
+test('check BinaryCountSetBits of 21.1 throws error', () => {
+  expect(() => BinaryCountSetBits(21.1)).toThrow()
+})
+test('check BinaryCountSetBits of {} throws error', () => {
+  expect(() => BinaryCountSetBits({})).toThrow()
+})