assert

assert( 
g_expression 
[ t_formatString
[ g_arg1 ] … ] )
) 
=> nil

Description

Enables you to insert assertions into the SKILL code, either at the top-level or within a function. It evaluates the expression (g_expression) and returns nil if the expression value is non-nil. Otherwise, throws an error and returns the unevaluated expression.

Arguments

g_expression	A generic expression.
t_formatString	Characters to be printed verbatim, intermixed with format specifications prefixed by the % sign.
g_arg1	The arguments following the format string are printed according to their corresponding format specifications.

Value Returned

nil	Assertion is successful.

Examples

assert(1 == 1)
=> nil

assert( 1==2 )

=> *ERROR* ASSERT FAILED: (1 == 2)

assert( 1==2 “Assertion failed.” )

=> *ERROR* Assertion failed.

a = 1

b = 2

assert( a==b “Assertion failed. %d is not equal to %d” a b )

=> *ERROR* Assertion failed. 1 is not equal to 2.

Related Topics

Core Functions

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