E005: write-only-variable

Metadata

• Code: E005
• Rule: write-only-variable
• Status: Stable since v0.0.1
• Quick fix: not available

What it does

Checks for variables that are written to but never read.

Why is this bad?

A variable that is only written to but never read is likely a bug or redundant code.

Example

fun main() {
    var x = 1;
E005: variable is only written to but never read
    x = 2;
    println("hello");
}

Use instead:

fun main() {
    println("hello");
}

Behavior notes

• Locals prefixed with _ are ignored.
• Mutable parameters (mutate) are ignored.
• Variables with zero usages are handled by unused-variable.
• This rule only reports variables with writes and no reads. Operations that imply reads (for example +=) do not match this rule.