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<p>
As well as let assignments Gleam also has constants, which are defined at the
top level of a module.
</p>
<p>
Constants must be literal values, functions cannot be used in their
definitions.
</p>
<p>
Constants may be useful for values that are used throughout your program,
permitting them to be named and to ensure there are no differences in the
definition between each use.
</p>
<p>
Using a constant may be more efficient than creating the same value in
multiple functions, though the exact performance characteristics will depend
on the runtime and whether compiling to Erlang or JavaScript.
</p>
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