A few functions to help you test your bitwise operations

foo-test.coffee

Foo = require("./foo.coffee")

describe 'Foo', ->
  testOpts =
    initialNumber: 255
    initialArray: [255,255,255]
    expectedBinary: 10010010101110101000

  it 'should return a correct binary string', ->
    foo = new Foo()
    binary = foo.intToBinary(testOpts.initialNumber)
    binary.should.equal "11111111"

  it 'should return a correct hexadecimal string', ->
    foo = new Foo()
    binary = foo.intToHexadecimal(testOpts.initialNumber)
    binary.should.equal "ff"

  it 'should return a correct binary string from an array', ->
    foo = new Foo()
    binary = foo.arrayToBinary(testOpts.initialArray)
    binary.should.equal "111111111111111111111111"

  it 'should return a correct hexadecimal string from an array', ->
    foo = new Foo()
    binary = foo.arrayToHexadecimal(testOpts.initialArray)
    binary.should.equal "ffffff"

foo.coffee

class Foo

  arrayToBinary: (array) -> (array.map (n) => @intToBinary(n)).join('')
  arrayToHexadecimal: (array) -> (array.map (n) => @intToHexadecimal(n)).join('')
  intToHexadecimal: (number) -> return parseInt(number).toString(16)
  intToBinary: (number) -> return parseInt(number).toString(2)
  
  
module.exports = Foo