Loop-Invariant Hoisting

Function calls inside loop bodies that don't depend on the loop variable — the result is the same on every iteration.

Rule details

Rule ID	loop-invariant-hoisting
Severity	INFO — worth knowing, may not matter at your scale
Confidence	LOW — heuristic, check manually
Category	Redundancy
Complexity	O(n × call) → O(call)

What it detects

for (Item item : items) {
    String timeout = config.getTimeout();  // same result every iteration
    item.apply(timeout);
}

config.getTimeout() doesn't reference item or any variable declared inside the loop.

What it skips

• Calls that reference the loop variable or any loop-local variable
• IO methods (side effects)
• Mutation methods, builder methods, cheap/trivial methods
• Object constructors (caught by expensive-construction)

Fix

String timeout = config.getTimeout();
for (Item item : items) {
    item.apply(timeout);
}