vtcode 0.123.7

A Rust-based terminal coding agent with modular architecture supporting multiple LLM providers
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id: no-string-concat-in-loop
language: Java
severity: warning
message: Use `StringBuilder` instead of string concatenation in loops.
note: |
  String concatenation (`+=` or `+`) inside a loop creates a new String object
  on each iteration, resulting in O(n^2) time complexity. Use `StringBuilder`
  for efficient string building in loops.
rule:
  any:
    - all:
        - pattern: $VAR = $VAR + $EXPR
        - any:
            - inside:
                kind: for_statement
                stopBy: end
            - inside:
                kind: enhanced_for_statement
                stopBy: end
            - inside:
                kind: while_statement
                stopBy: end
    - all:
        - pattern: $VAR += $EXPR
        - any:
            - inside:
                kind: for_statement
                stopBy: end
            - inside:
                kind: enhanced_for_statement
                stopBy: end
            - inside:
                kind: while_statement
                stopBy: end
files:
  - "**/*.java"
  - "!**/test/**"