Master programming syntax, solve interactive challenges & run live code in Syntaxis Explore Arena →
menu_book Course Curriculum (Nim) expand_more
Syntax and Values
let bindings var bindings const type inference indentation blocks comments string interpolation tuples object types enums
Control Flow
if elif else case for ranges for items while block and break continue when compile-time defer discard
Procedures
proc func method iterator template macro default parameters named arguments var parameters openArray parameters
Collections
seq arrays sets tables ordered tables string operations slices mapIt filterIt collect macro
Types
distinct types ref object object inheritance variants generics concepts option result pattern range types static types
Metaprogramming
templates untyped templates typed templates macros quote do AST inspection static blocks compileTime procs mixin bind
Memory and Concurrency
ref counting ARC ORC move semantics sink parameters threads threadvar locks channels async proc await
Modules and I/O
import from import export include readFile writeFile streams parseJson exceptions unit tests
Nim / Procedures

var parameters

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

10 min read • Intermediate

var parameters is a focused Nim topic inside Procedures. 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 var parameters, then change one input and predict the result before running it.

Topic-specific example

nim-03-09-var-parameters.nim
nim Try It Live 
proc inc2(x:var int)=x+=2
var n=1; inc2(n)
Edge case / engineering note

var parameters 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

var parameters Mastery Check →
← PREVIOUS
named arguments
NEXT →
openArray parameters