The challenge

Write a function that takes in a binary string and returns the equivalent decoded text (the text is ASCII encoded).

Each 8 bits on the binary string represent 1 character on the ASCII table.

The input string will always be a valid binary string.

Characters can be in the range from “00000000” to “11111111” (inclusive)

Note: In the case of an empty binary string your function should return an empty string.

The solution in Python code

Option 1:

def binary_to_string(binary):
    return "".join(chr(int(binary[i:i+8],2)) for i in range(0,len(binary),8))

Option 2:

def binary_to_string(binary):
    result = ""
    
    while binary:
        result += chr(int(binary[:8], 2))
        binary = binary[8:]
    
    return result

Option 3:

import re

def binary_to_string(binary):
    return re.sub(r'.'*8, lambda e: chr(int(e.group(), 2)), binary)

Test cases to validate our solution

import random

test.assert_equals(binary_to_string(''), '', 'Must handle empty string')
test.assert_equals(binary_to_string('0100100001100101011011000110110001101111'), 'Hello', 'Must handle basic works')
test.assert_equals(binary_to_string('00110001001100000011000100110001'), '1011', 'Must handle numeric characters')
test.assert_equals(binary_to_string('0101001101110000011000010111001001101011011100110010000001100110011011000110010101110111001011100010111000100000011001010110110101101111011101000110100101101111011011100111001100100000011100100110000101101110001000000110100001101001011001110110100000100001'), 'Sparks flew.. emotions ran high!', 'Must handle special charaters')
test.assert_equals(binary_to_string('0010000101000000001000110010010000100101010111100010011000101010001010000010100101010001010101110100010101110010011101000111100101010101010010010100111101001100011001000110011001100111011000100110001001101000011011100110110101001001010010110100001001001010010010110100100001001001010101010100111100101000001111110011111000111111001111000111111001111110011111100111111001111110001010010010100000101010001001100010010101011110001110010011100000110111001100010011001100101111001011010010111100101010001011010010101000101111'), '[email protected]#$%^&*()QWErtyUIOLdfgbbhnmIKBJKHIUO(?>?<~~~~~)(*&%^98713/-/*-*/', 'Must handle special charaters')

# Must handle random string
random_string = ''.join(c
    for _ in range(12)
    for c in random.choice('qwertyuiopasdfghjklzxcvbnm0123456789'))
random_string_binary = ''.join('{:08b}'.format(ord(c)) for c in random_string)
test.assert_equals(binary_to_string(random_string_binary), random_string, 'Must handle random string')