Code inspection: Local variable has too wide declaration scope

tip

You can suppress this inspection to ignore specific issues, change its severity level to make the issues less or more noticeable, or disable it altogether.

JetBrains Rider suggests moving the declaration of a local variable closer to its usage. If a variable is not used outside a block of instructions, it is a good practice to declare it within that block.

In the example, JetBrains Rider suggests moving the declaration of tmpvar inside the for loop, where tmpvar is used.

private static char[] MyMethod(char[] x)
{
    char tmpvar;
    for (int i = 0; i < x?.Length / 2; i++)
    {
        tmpvar = x[i];
        x[i] = x[x.Length - 1 - i];
        x[x.Length - 1 - i] = tmpvar;
    }
    return x;
}

private static char[] MyMethod(char[] x)
{
    for (int i = 0; i < x?.Length / 2; i++)
    {
        var tmpvar = x[i];
        x[i] = x[x.Length - 1 - i];
        x[x.Length - 1 - i] = tmpvar;
    }
    return x;
}

If possible, JetBrains Rider will automatically join the declaration and assignment, and according to the default preferences will change the explicit variable type to var when it applies this quick-fix.