You can tweak the character set to fit your needs. This code will produce strings of the following form: TufwGfXZskHlPcYrLNKg. Then we take advantage of calling Array.new with a block, which lets us initialize an array of size n with the values produced by the block. joinįirst, we prepare our charset using ranges and converting them to arrays. Here is the code: def generate_code(number)Ĭharset = Array('A'.'Z') + Array('a'.'z')Īrray.new(number). The ultimate randomness application is to generate a random string with a custom character set. It’s also possible to pass a custom random generator as an argument: You can pass an integer argument to sample to get N unique elements from the array: You can use sample for ranges, this code generates a random letter: You may want to get a random pick from a list.īut Ruby has the sample method which is better suited (and faster) for this task: Ruby 2.5 introduced a new method, which produces random alphanumeric strings: Using hex can generate a hexadecimal fixed-width string. SecureRandom has other output formats available. SecureRandom seeds its generator from /dev/urandom on Unix systems & on windows it uses the CryptAcquireContext / CryptGenRandom API.Īs you can see this works a lot like rand, you can also pass in a max number. …but if you want to use them for security purposes -like generating a password reset token- then you should use SecureRandom, which is part of the Ruby standard library. The numbers produced by rand might be enough for a simple application… You can use a range to get exactly what you need. Ruby random number generation is really easy, but what if you need the number to be in a specific range instead of starting from zero? You can pass an argument to rand to generate a number starting from zero up to (but not including) that number. Rand produces floating point numbers ( 0.4836732493) if called without any arguments. You can generate Ruby random numbers using the rand method: Let’s go over some examples! Generating Random Numbers Other ways to generate randomness in Ruby include: With a range argument ( rand(1.20)) you get an integer between the start of the range & the end of the range.With an integer argument ( rand(10)) you get a new integer between 0 & that number.Without arguments, rand gives you a floating point number between 0 & 1 (like 0.4836732493).In Ruby, there are many ways to generate random numbers with various properties. With a random number you can pick a random element from an array, pick a winner from a list, generate dice rolls, etc. If you want to learn how to generate random numbers & strings in Ruby, then you’re in the right place.īecause that’s exactly what this article is about!
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