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Nim / Metaprogramming

untyped templates

Learn untyped templates in Nim with a construct-specific explanation, unique example, engineering boundary, and mastery check.

10 min read • Intermediate

untyped templates is a focused Nim topic inside Metaprogramming. This lesson explains the construct itself, the state or value it operates on, and the observable result it produces.

Read the example as a small executable experiment. Identify the exact syntax that belongs to untyped templates, then change one input and predict the result before running it.

Topic-specific example

nim-06-02-untyped-templates.nim
nim Try It Live 
template logExpr(x:untyped) = echo astToStr(x), " = ", x
Edge case / engineering note

untyped templates has rules that are easy to miss when the example is copied mechanically. Check the feature-specific boundary shown by this construct: scope, mutability, evaluation order, type constraints, lifetime, error behavior, compile-time restrictions, or resource cleanup where applicable.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

untyped templates Mastery Check →
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