assert

Verifies that a condition is true.

Syntax

• assert(b[, s])

  • b is a boolean

  • s is a string

Description

If b is true, then assert(b, s) returns null; otherwise, assert(b, s) raises an error with message s.

Examples

assert(n > 0, "n must be positive")

failure

n must be positive

Call stack: assert

See also

• try

• succeeded

• error (fail)