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*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"
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