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AssertionError

AssertionError([msg])

The asserted condition did not evalutate to true. Optional argument msg is a descriptive error string.

Examples

1. Throw a basic assertion error:

   julia> assert(false, "This is an assertion error")
   ERROR: AssertionError: This is an assertion error

   This example throws an AssertionError with the provided error message when the condition false is evaluated.

2. Assert inequality using an error message:

   julia> x = 5
   5
   
   julia> assert(x != 5, "x should not be equal to 5")
   ERROR: AssertionError: x should not be equal to 5

   In this example, an AssertionError is thrown with the given error message if the condition x != 5 is not satisfied.

3. Assert a condition without an error message:

   julia> assert(2 + 2 == 5)
   ERROR: AssertionError

   This example throws a basic AssertionError when the condition 2 + 2 == 5 is not true.

Common mistake example:

julia> assert(1 == 2, "This should fail")
ERROR: AssertionError: This should fail

In this example, the condition 1 == 2 is expected to be false, but it evaluates to true. Double-check that the condition used in the assert statement is correct to avoid such mistakes.

See Also

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