vector-logic

Flag the vectorized &/| used directly in an if/while condition, where the scalar &&/|| is meant.

A condition needs a single TRUE/FALSE: R only looks at the first element (a length > 1 condition is an error since R 4.2), and &&/|| short-circuit. The fix doubles the operator. Operators inside a function call (if (any(a | b))) are left alone — a vector result is the point there.

Vectorized & in an if condition:

if (a & b) {
  go()
}

warning: vector-logic
 --> example.R:1:7
  |
1 | if (a & b) {
  |       ^ `&` in a condition; use `&&`
  = help: Use the scalar `&&` in an `if`/`while` condition.

After applying the fix:

if (a && b) {
  go()
}