help/assert_assertwithmessage.md


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

# Exclamation Mark (`!`)

## `! 𝕩`: Assert

Throw an error if `𝕩` is not 1.

           ! 1

           ! 2

           ! "hello"


## `𝕨 ! 𝕩`: Assert With Message

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

           "hi" ! 1

           "two" ! 2

           "hello error" ! "hello"