use_is_even_rather_than_modulo

Use '{0}' rather than '% 2'.

The analyzer produces this diagnostic when the result of applying the modulo operator % to an integer value, with 2 as the right operand, is compared to 0 or 1 using == rather than using the isEven or isOdd getter.

The following code produces this diagnostic because the result of x % 2 is compared to 0 to check whether x is even:

bool f(int x) => x % 2 == 0;

The following code produces this diagnostic because the result of x % 2 is compared to 1 to check whether x is odd:

bool f(int x) => x % 2 == 1;

If you're checking whether a value is even, then use the isEven getter:

bool f(int x) => x.isEven;

If you're checking whether a value is odd, then use the isOdd getter:

bool f(int x) => x.isOdd;