Enforced immutability: Difference between revisions

</pre>

{{libheader|Wren-trait}}

Since the above entry was written, a ''Const'' class has been added to ''Wren-trait'' which simulates constants to some extent though the values used need themselves to be immutable for this to be water-tight.

=={{header|Wren}}==

<syntaxhighlight lang="ecmascript">import "./trait" for Const

Const["six"] = 6

Const["eight"] = 8

Const["six"] = 7 // ignored, still 6

System.print(Const.entries)</syntaxhighlight>

{{out}}

<pre>

[eight:8, six:6]