# V7009\. A parameter is not used in a function, constructor, or method\.

The analyzer has detected a suspicious function, constructor, or method where one of the parameters is never used\. However, another parameter is used multiple times, which may indicate an error\.

The example:

```cpp
function cardHasLock(width, height) {
  const X_SCALE = 0.051;
  const Y_SCALE = 0.0278;

  const lockWidth = Math.round(height * X_SCALE);  // <=
  const lockHeight = Math.round(height * Y_SCALE);
}
```

The `width` parameter is never used in the body of the function, while the `height` parameter is used twice, including when the `lockWidth` constant is initialized\. This behavior is erroneous\.

The fixed code for initializing the `lockWidth` constant:

```cpp
const lockWidth = Math.round(width * X_SCALE);
```

If a parameter is not being used on purpose, either replace its name with `_` or add `_` as the first character of its name\. This is a common practice among developers to indicate that a parameter is not used:

```cpp
function handler(_, res) {
  res.status(200);
  res.send("ok");
}
```