Puppet Function: is_a

Defined in:
puppet/modules/stdlib/lib/puppet/functions/is_a.rb
Function type:
Ruby 4.x API

Overview

is_a(Any $value, Type $type) ⇒ Any

Boolean check to determine whether a variable is of a given data type. This is equivalent to the `=~` type checks.

See the documentation for “The Puppet Type System” for more information about types. See the `assert_type()` function for flexible ways to assert the type of a value.

Examples:

how to check a data type

# check a data type
    foo = 3
    $bar = [1,2,3]
    $baz = 'A string!'

    if $foo.is_a(Integer) {
      notify  { 'foo!': }
    }
    if $bar.is_a(Array) {
      notify { 'bar!': }
    }
    if $baz.is_a(String) {
      notify { 'baz!': }
    }

Parameters:

  • value (Any)
  • type (Type)

Returns:

  • (Any) 


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# File 'puppet/modules/stdlib/lib/puppet/functions/is_a.rb', line 22

Puppet::Functions.create_function(:is_a) do
  dispatch :is_a do
    param 'Any', :value
    param 'Type', :type
  end

  def is_a(value, type)
    # See puppet's lib/puppet/pops/evaluator/evaluator_impl.rb eval_MatchExpression
    Puppet::Pops::Types::TypeCalculator.instance?(type, value)
  end
end