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---
title: Custom predicates
layout: gem-single
name: dry-logic
---
Define custom predicates using the `predicate` method. Use the build in builder to evaluate and define your predicate.
``` ruby
extend Dry::Logic::Builder
build do
predicate :divisible_with? do |num, input|
(input % num).zero?
end
end
```
Then create your predicate
``` ruby
is_divisible_with_ten = build do
divisible_with?(10)
end
```
Here, `10` represents the first argument `num` to `divisible_with?`.
``` ruby
# 10 & 5 is passed as {input} to your method
is_divisible_with_ten.call(10).success? # => true
is_divisible_with_ten.call(5).success? # => false
```
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