I understand the concept of using double negation prefixes and TypeScript's single postfix (non-null assertion).
However, I am curious about the usage of a double postfix exclamation mark.
/.*verification code is (\d{6}).*/.exec(email.body!!)!![1]This code snippet was sourced from here.
It's kind of like the way !! functions in JavaScript, but somewhat pointless.
! declares that the previous expression is not nullish.
! can be applied after expressions as well.
expression! confirms that expression is not nullish.
expression!! confirms that expression! is not nullish.
Using just one ! is sufficient, although using more is technically allowed. The following example is also valid:
/.*verification code is (\d{6}).*/.exec(email.body!!!!!!)!!!![1]
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