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

# Exclamation Mark (`!`)

## `! 𝕩`: Assert
[→full documentation](../doc/assert.md)

Throw an error if `𝕩` is not 1.

        ! 1

        ! 2

        ! "hello"




## `𝕨 ! 𝕩`: Assert With Message
[→full documentation](../doc/assert.md)

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

        "hi" ! 1

        "two" ! 2

        "hello error" ! "hello"