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`class Proc`

Definitions

`def raise?(*exceptions)`

Call the proc and check whether it raises one of the given exceptions.

Signature

parameter　exceptions　Array(Class): Exception classes to catch (defaults to RuntimeError).
returns　Exception | Boolean: The caught exception, or false if none was raised.

Implementation

def raise?(*exceptions)
  call
rescue *(exceptions.empty? ? RuntimeError : exceptions) => e
  e
else
  false
end

`def throw?(sym)`

Call the proc and check whether it throws the given symbol.

Signature

parameter　sym　Symbol: The symbol to catch.
returns　Boolean

Implementation

def throw?(sym)
  catch(sym) {
    call
    return false
  }
  return true
end

`def change?`

Call the proc and check whether it changes the result of the given block.

Signature

returns　Boolean

Implementation

def change?
  pre_result = yield
  call
  post_result = yield
  pre_result != post_result
end