Empty string: Difference between revisions

=={{header|Bracmat}}==

There are two ways to assign a string to a variable. The variant using the <code>=</code> operator does not evaluate the value before the assignment, the variant using the <code>:</code> (match) operator does. If the value is a string, there is no difference, as a string always evaluates to itself.

<lang bracmat>( :?a

& (b=)

& abra:?c

& (d=cadabra)

& !a: { a is empty string }

& !b: { b is also empty string }

& !c:~ { c is not an empty string }

& !d:~ { neither is d an empty string }

)

</lang>