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Variables (referred to as $name) can be defined in
range and with actions. For range, the syntax is:
{{range $index, $element = pipeline }} T1 {{end}}
where index and element are arbitrary variable names. When executing this action, during each iteration $index and $element are set to the index (attribute name) and value of each successive element. Dot remains unaffected.
For with, the syntax is:
{{with $var = pipeline }} T1 {{end}}
Pipeline is evaluated, its result is assigned to $var and the T1 block is executed with dot unchanged.
A variable’s scope extends to the end action of the control
structure (with or range) in which it is declared. This
includes any nested statements that may appear in between.