operator
Comparison
== != < <= > >=
The comparison operators — == (equal), != (not equal), <, <=, >, >= — take two values and yield a bool, the kind of test an if or where clause wants. On string values == and != compare by content, so direction == "left" checks the characters, not the pointer (a comparison against null stays a pointer test). Comparison binds looser than arithmetic and looser than the bitwise operators, so flags & MASK == 0 reads as (flags & MASK) == 0 with no parentheses needed. Chain several conditions together with and / or.
Example
if current_health <= 0 { become GameOver }
if pressed_key == 'w' and elapsed_frames > 0 { row = row - 1 }