diff --git a/benchmark/core/array/bench_reject.rb b/benchmark/core/array/bench_reject.rb
new file mode 100644
index 0000000000..4a1614642a
--- /dev/null
+++ b/benchmark/core/array/bench_reject.rb
@@ -0,0 +1,43 @@
+require 'benchmark'
+require 'benchmark/ips'
+
+Benchmark.ips do |x|
+  strings = ('a'..'j').to_a
+  numbers = [-4, -81, 0, 5, 12, -1_000_000, 1, 10, 100, 1000]
+
+  x.report "reject string" do |times|
+    i = 0
+    while i < times
+      a = strings.dup
+      a.reject { |v| v < 'd' }
+      i += 1
+    end
+  end
+
+  x.report "reject numbers" do |times|
+    i = 0
+    while i < times
+      a = numbers.dup
+      a.reject { |v| v < 10 }
+      i += 1
+    end
+  end
+
+  x.report "reject! string" do |times|
+    i = 0
+    while i < times
+      a = strings.dup
+      a.reject! { |v| v < 'd' }
+      i += 1
+    end
+  end
+
+  x.report "reject! numbers" do |times|
+    i = 0
+    while i < times
+      a = numbers.dup
+      a.reject! { |v| v < 10 }
+      i += 1
+    end
+  end
+end
diff --git a/benchmark/core/array/bench_select.rb b/benchmark/core/array/bench_select.rb
new file mode 100644
index 0000000000..ffe844909e
--- /dev/null
+++ b/benchmark/core/array/bench_select.rb
@@ -0,0 +1,25 @@
+require 'benchmark'
+require 'benchmark/ips'
+
+Benchmark.ips do |x|
+  strings = ('a'..'j').to_a
+  numbers = [-4, -81, 0, 5, 12, -1_000_000, 1, 10, 100, 1000]
+
+  x.report "select string" do |times|
+    i = 0
+    while i < times
+      a = strings.dup
+      a.select { |v| v > 'd' }
+      i += 1
+    end
+  end
+
+  x.report "select numbers" do |times|
+    i = 0
+    while i < times
+      a = numbers.dup
+      a.select { |v| v > 10 }
+      i += 1
+    end
+  end
+end