Clamp for min/max values
In my article on value objects, the example involved constraining an integer to a minimum and maximum value in the #initialize method. As of Ruby 2.4, there’s a handy method for that: #clamp. The documentation for the method is in the Comparable module.
Instead of…
…using Array#min and Array#max to constrain a value within a range:
value = 1000
[[0, value].max], 255].min
#=> 255
value = -100
[[0, value].max], 255].min
#=> 0
Use…
…Ruby’s #clamp method.
value = 1000
value.clamp(0, 255)
#=> 255
value = -100
value.clamp(0, 255)
#=> 0
Why?
The standard library is deliberately expansive and elegant.
This is the exact use case for the problem I was trying to solve, so why use more verbose syntax?
Why not?
There’s no reason not to. Maybe you like the look of confusing square brackets?
Thanks
My appreciation to Justin for pointing out my pre-2.4 Ruby.
Sign up to get a nugget of Ruby knowledge every couple of weeks or so.
Last updated on August 11th, 2019