CODEWITHSUNDEEP
ruby
JahMyst
JahMyst

Reputation: 1686

Ruby conditional assignment

What is the Ruby way to assign a variable a to another variable b if a is superior to b ?

I have three possibilities so far :

More broadly, is there a way to set an upper limit to a variable ? e.g: if I try to set a = 50 and a has an upper limit of 25, a will be equal to 25 after assignment.

Upvotes: 1

Views: 894

Answers (4)

alexanderbird
alexanderbird

Reputation: 4218

How about a > b && a = b

where b is that upper limit. 

b = 25
a = 25
a > b && a = b #> false; a = 25
a = 26 
a > b && a = b #> true; a = 25

Upvotes: 2

Linuxios
Linuxios

Reputation: 35788

All three options work, it's just a question of style.

I'd go with number 2. It most clearly communicates your intent, while avoiding extraneous keywords (number 1) or excessively terse one liners (number 3).

In answer to your more general question, there is no way to override variable assignment in Ruby. You can override assignment to instance variables using setter methods though. If you just want to do it afterwords, the code from your question is sufficient:

a = something
a = 25 if a > 25

Upvotes: 5

bpromas
bpromas

Reputation: 694

Try: b = a > b ? a : b

It's the same as writing:

if a > b
  b = a
else
  b = b
end

Upvotes: 1

Long Nguyen
Long Nguyen

Reputation: 11275

So you ask for the upper limit:

UPPER_LIMIT = 25
b = 100
a = [b, UPPER_LIMIT].min

a will always smaller or equal to 25.

Upvotes: 5

Related Questions