Beyond speed, though, it’s important to keep in mind that eval, when dealing with tainted strings, is also a potential risk for code injection attacks.

send is actually twice as fast as call if you (must) create the method object before each call, which is a more realistic scenario:


require "benchmark"
test = "hi man"
n = 100000
Benchmark.bmbm {|x|
x.report("call") { n.times { m = test.method(:length); m.call } }
x.report("send") { n.times { test.send(:length) } }
x.report("eval") { n.times { eval "test.length" } }
}

# results:
# user system total real
# call 0.110000 0.000000 0.110000 ( 0.115235)
# send 0.050000 0.000000 0.050000 ( 0.046434)
# eval 1.750000 0.020000 1.770000 ( 1.779832)


this helps me a lot

many thanks