diff --git a/lib/puppet/functions/with.rb b/lib/puppet/functions/with.rb
new file mode 100644
index 000000000..1b2b1e0e4
--- /dev/null
+++ b/lib/puppet/functions/with.rb
@@ -0,0 +1,15 @@
+# Call a lambda with the given arguments. Since the parameters of the lambda
+# are local to the lambda's scope, this can be used to create private sections
+# of logic in a class so that the variables are not visible outside of the
+# class.
+Puppet::Functions.create_function(:with) do
+  dispatch :with do
+    param 'Object', 'arg'
+    arg_count(0, :default)
+    required_block_param
+  end
+
+  def with(*args)
+    args[-1].call({}, *args[0..-2])
+  end
+end
diff --git a/spec/unit/functions/with_spec.rb b/spec/unit/functions/with_spec.rb
new file mode 100644
index 000000000..d5d6989e4
--- /dev/null
+++ b/spec/unit/functions/with_spec.rb
@@ -0,0 +1,31 @@
+require 'spec_helper'
+
+require 'puppet_spec/compiler'
+require 'matchers/resource'
+
+describe 'the with function' do
+  include PuppetSpec::Compiler
+  include Matchers::Resource
+
+  before :each do
+    Puppet[:parser] = 'future'
+  end
+
+  it 'calls a lambda passing no arguments' do
+    expect(compile_to_catalog("with() || { notify { testing: } }")).to have_resource('Notify[testing]')
+  end
+
+  it 'calls a lambda passing a single argument' do
+    expect(compile_to_catalog('with(1) |$x| { notify { "testing$x": } }')).to have_resource('Notify[testing1]')
+  end
+
+  it 'calls a lambda passing more than one argument' do
+    expect(compile_to_catalog('with(1, 2) |*$x| { notify { "testing${x[0]}, ${x[1]}": } }')).to have_resource('Notify[testing1, 2]')
+  end
+
+  it 'errors when not given enough arguments for the lambda' do
+    expect do
+      compile_to_catalog('with(1) |$x, $y| { }')
+    end.to raise_error(/Too few arguments/)
+  end
+end