Enforced immutability: Difference between revisions
added Factor
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As a functional language, everything in F# is immutable by default. Interestingly, <code>const</code> is a reserved word but is non-functional.
<lang fsharp>let hello = "Hello!"</lang>
=={{header|Factor}}==
Tuple slots may be declared <code>read-only</code>. For example, the <code>range</code> class declares its slots <code>read-only</code>:
<lang factor>TUPLE: range
{ from read-only } { length read-only } { step read-only } ;</lang>
Note that the <code>CONSTANT:</code> word does nothing to enforce immutability on the object it places on the stack, as it is functionally equivalent to a standard word definition with stack effect <code>( -- obj )</code>.
=={{header|Go}}==
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