Automatic conversion to Boolean

Describes the automatic conversion of non-Booleans to Booleans.

When a function, method or statement which expects a Boolean value as one of its arguments is passed a non-Boolean value, this value is automatically converted to a Boolean value as follows:

• The number 0 yields false.

• The empty string "" yields false.

• The null value yields false.

• The undefined value yields false.

• Any other non-Boolean values yield true.

For example:

if ("") writeln("True"); else writeln("False");
if (123) writeln("True"); else writeln("False"); 

This displays “False”, then “True”.