*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/!assert assertwithmsg.html).*

# Exclamation Mark (`!`)

`! 𝕩`: Assert

Throw an error if `𝕩` is not 1.

       ! 1
    1
       ! 2
    Error: Assertion error
    at ! 2
       ^
       ! "hello"
    Error: hello
    at ! "hello"


`𝕨 ! 𝕩`: Dyad

Throw an error with message `𝕨` if `𝕩` is not 1.

       "hi" ! 1
    1
       "two" ! 2
    Error: two
    at "two" ! 2
             ^
       "hello error" ! "hello"
    Error: hello error
    at "hello error" ! "hello"