presence() public

Returns object if it’s #present? otherwise returns nil. object.presence is equivalent to object.present? ? object : nil.

This is handy for any representation of objects where blank is the same as not present at all. For example, this simplifies a common check for HTTP POST/query parameters: 

 state = params[:state] if params[:state].present? country = params[:country] if params[:country].present? region = state || country || 'US'

…becomes: 

 region = params[:state].presence || params[:country].presence || 'US'
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