Convert binary string to hexadecimal in Ruby

Question

What is the most efficient way to convert a binary string into hexadecimal? I'm trying to do something like this:

a = '1010'    #Binary

and then to become

a = 'A'       #Hexa

Pascal · Accepted Answer · 2017-07-30 10:44:30Z

4

You can convert it to an integer first, hinting that the string is binary (to_i(2)), then to hexadecimal (to_s(16)

"1010".to_i(2).to_s(16) # => 'a'

If you need it in uppercase, you can call upcase on the resulting string.

edited Jul 30, 2017 at 10:44

answered Jul 18, 2017 at 22:30

Pascal

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2 Comments

Jörg W Mittag Over a year ago

to_i(2) doesn't convert to decimal. It converts to an integer. Integers aren't decimal or binary or hexadecimal, they just are. Only string interpretations of numbers have a base, numbers themselves don't.

Pascal Over a year ago

@JörgWMittag clarified the answer. WDYT?

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