Assertion

assert

[assert: condition; message?]

Verifies that condition is true before continuing program execution.

If condition is false, raises a runtime error; otherwise, does nothing.

The message displayed in the runtime error can be customized by passing a string to message.

Parameters

condition ← bool
The condition to check.

message ← string (optional)
The error message to display if the condition is not satisfied.

Examples

# does absolutely nothing
[assert: @true]

# [assertion error] assertion failed: condition was false
[assert: @false]

# [assertion error] ooooops!
[assert: @false; "ooooops!"] 

assert-not

[assert-not: condition; message?]

Verifies that condition is false before continuing program execution.

Like [assert], a custom error message can be provided.

assert-eq

[assert-eq: actual; expected; message?]

Verifies that expected and actual are equal before continuing program execution.

Like [assert], a custom error message can be provided.

Parameters

actual ← any
The actual value to test.

expected ← any
The expected value to test against.

message ← string
The error message to display if the condition is not satisfied.

assert-neq

[assert-neq: actual; unexpected; message?]

Verifies that unexpected and actual are not equal before continuing program execution.

Like [assert], a custom error message can be provided.

Parameters

actual ← any
The actual value to test.

unexpected ← any
The unexpected value to test against.

message ← string
The error message to display if the condition is not satisfied.