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Uppercase function 'undefind' for locale. #4386

BMK91 opened this Issue Jan 2, 2018 · 2 comments


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BMK91 commented Jan 2, 2018

I'm reviewing tutorial

I got an issue for the following:
localeData = moment.localeData();
Uncaught TypeError: Cannot read property 'toUpperCase' of undefined

Also recently found.
Uncaught TypeError: Cannot read property 'replace' of undefined

Uncaught TypeError: Cannot read property 'year' of undefined

Please resolve this issue.
Thank you.

@marwahaha marwahaha added the Bug label Jan 2, 2018


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AlexanderEllis commented Jan 3, 2018

I saw this was marked as a bug, but I did a little digging and think it might not actually be one. Below this link, the docs say that "The returned object has the following methods:"

localeData.longDateFormat(dateFormat);  // returns the full format of abbreviated date-time formats LT, L, LL and so on
localeData.relativeTime(number, withoutSuffix, key, isFuture);  // returns relative time string, key is on of 's', 'm', 'mm', 'h', 'hh', 'd', 'dd', 'M', 'MM', 'y', 'yy'. Single letter when number is 1.
localeData.week(aMoment);  // returns week-of-year of aMoment

Calling these functions without the proper arguments (like localeData.longDateFormat();) does indeed throw these typeErrors, as the dateFormat would not be provided. Maybe not the most elegant result, but is this what we would expect?

That being said, I also missed this in the docs at first glance and spent some time digging through the code, as the method signatures seem to imply you can call these without arguments. I only noticed it after returning to the docs and scrolling down to see if what I found matched anything there.

Looks like the method signatures in the docs could use some updating. If that sounds about right, I can go ahead and update these ones as needed.

The only thing I'm not sure about is some of the methods that seem to behave differently with or without arguments. For instance, moment.localeData().months() returns all months, but it seems that moment.localeData().months(moment()) is different, in that it just returns the current month.


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marwahaha commented Apr 4, 2018

Yea, this looks like a documentation issue. Thanks @AlexanderEllis

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