I haven't seen this discussed on ESDiscuss before. For those not familiar with user-defined literals: Essentially, they allow certain literals (e.g. 123.45, "hello") to produce a user-defined object by marking the literal with a user-defined suffix.

They were introduced in C++11 [1], and I'm not sure if any other language has implemented them.They were also discussed on Python-ideas [2].

Some potential use cases:

- Since ES2015, built-ins are subclassable, so you could use a literal to call custom constructors (e.g. for custom string objects)
- Units (e.g. `100m + 2cm`)
- Numbers may be specified in arbitrary bases (e.g. `124_9 === Number.parseInt(124, 9)`) - Complex numbers, quaternions, … (you could make these even nicer with operator overloading)

Any opinions?

— kdex

[1] http://en.cppreference.com/w/cpp/language/user_literal
[2] https://mail.python.org/pipermail/python-ideas/2015-June/033871.html
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