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Adding code to a javascript function programmatically

I'm attempting to customize an existing JS library without modifying the original JS code. This code loads in a few external JS files which I do have access to, and what I'd like to do is change one of the functions contained in the original file without copying and pasting the whole thing into the...
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How can I determine if a variable is 'undefined' or 'null'?

How do I determine if variable is undefined or null ? 30 Answers 30 ...
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How to trigger the onclick event of a marker on a Google Maps V3?

How do I trigger the onclick event of a marker on a Google Maps from outside the map? 2 Answers ...
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How to get the Android device's primary e-mail address

How do you get the Android's primary e-mail address (or a list of e-mail addresses)? 12 Answers ...
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How many bits or bytes are there in a character? [closed]

How many bits or bytes are there per "character"? 2 Answers 2 ...
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How to retrieve a user environment variable in CMake (Windows)

I know how to retrieve a normal machine wide environment variable in CMAKE using 4 Answers ...
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Truncate a list to a given number of elements

What method truncates a list--for example to the first 100 elements--discarding the others (without iterating through individual elements)? ...
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Good way of getting the user's location in Android

Getting the user's current location within a threshold ASAP and at the same time conserve battery. 10 Answers ...
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Difference between Select and ConvertAll in C#

I have some List: 4 Answers 4 ...
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How to determine the number of days in a month in SQL Server?

I need to determine the number of days in a month for a given date in SQL Server. 28 Answers ...