Let's just quickly run through the main use cases for the lookup( ) function, also showing the equivalent usages of the old hiera( ) function:
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The following usage is a completely regular lookup:
lookup('ntp::user') # equivalent to hiera('ntp::user')
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The following usage is a regular lookup, while providing a default:
lookup('ntp::user','root') # equivalent to hiera('ntp::user','root')
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The following usage is an array lookup:
lookup('my_ntp_servers', Array, 'unique') # equivalent to hiera_array('ntp_servers')
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The following is a deep-merge lookup:
lookup('users', Hash, 'deep') # equivalent to hiera_hash('users') with deep
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The following is a classification lookup:
lookup('classes', Array[String], 'unique').include ...
