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複習下二進制及 Ruby 內建好用方法

Codewars LV7

題目(Binary Addition)：

Implement a function that adds two numbers together and returns their sum in binary. The conversion can be done before, or after the addition.

The binary number returned should be a string.

def add_binary(a,b)
  #your code here
end

Test.assert_equals(add_binary(1,1),"10")
Test.assert_equals(add_binary(0,1),"1")
Test.assert_equals(add_binary(1,0),"1")
Test.assert_equals(add_binary(2,2),"100")
Test.assert_equals(add_binary(51,12),"111111")

影片解題：

答案：

# Binary Addition
def add_binary(a,b)
  (a + b).to_s(2)
end

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