bench.rb

require "benchmark"
float_array = 100000.times.map { rand }
1000.times { float_array << nil }
float_array.shuffle!

Benchmark.bmbm do |x|
  x.report("any?") { 100.times { float_array.any?(&:nil?) ? nil : float_array.min } }
  x.report("all?") { 100.times { float_array.all? ? float_array.min : nil } }
  x.report("min block") { 100.times { minimum = float_array.min { |a, b| a && b ? a <=> b : -1 }; minimum == -1 ? nil : minimum } }
  x.report('smart ass') { 100.times { float_array.min rescue nil } }
end

NoNils

Rehearsal ---------------------------------------------
any?        1.270000   0.010000   1.280000 (  1.285305)
all?        0.870000   0.000000   0.870000 (  0.880658)
min block   1.270000   0.010000   1.280000 (  1.284267)
smart ass   0.670000   0.010000   0.680000 (  0.689223)
------------------------------------ total: 4.110000sec

                user     system      total        real
any?        1.240000   0.010000   1.250000 (  1.258006)
all?        0.880000   0.010000   0.890000 (  0.890891)
min block   1.240000   0.010000   1.250000 (  1.262233)
smart ass   0.670000   0.000000   0.670000 (  0.673408)

Results

Rehearsal ---------------------------------------------
any?        0.000000   0.000000   0.000000 (  0.000606)
all?        0.000000   0.000000   0.000000 (  0.000224)
min block   1.240000   0.010000   1.250000 (  1.254697)
smart ass   0.000000   0.000000   0.000000 (  0.001102)
------------------------------------ total: 1.250000sec

                user     system      total        real
any?        0.000000   0.000000   0.000000 (  0.000510)
all?        0.000000   0.000000   0.000000 (  0.000295)
min block   1.240000   0.010000   1.250000 (  1.258530)
smart ass   0.000000   0.000000   0.000000 (  0.001134)