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Why does javascript map function return undefined?

...e result. The map function is used to map one value to another, but it looks you actually want to filter the array, which a map function is not suitable for. What you actually want is a filter function. It takes a function that returns true or false based on whether you want the item in the resul...
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How do I make an Android EditView 'Done' button and hide the keyboard when clicked?

When the user clicks on the EditView , Android opens the keyboard so that user can write in the EditView . 17 Answers ...
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How long should SQL email fields be? [duplicate]

...y. However, I was wondering what the "standard" is? How long do you guys make it? (same question for Name field...) 8 Answe...
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How do you calculate log base 2 in Java for integers?

... If you are thinking about using floating-point to help with integer arithmetics, you have to be careful. I usually try to avoid FP calculations whenever possible. Floating-point operations are not exact. You can never know for sure what w...
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How to find all combinations of coins when given some dollar value

... I looked into this once a long time ago, and you can read my little write-up on it. Here’s the Mathematica source. By using generating functions, you can get a closed-form constant-time solution to the problem. Graham, Knuth, a...
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What's valid and what's not in a URI query?

I've been Googling this back and forth reading RFCs and SO questions trying to crack this, but I still don't got jack. 7 An...
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How to store values from foreach loop into an array?

... Andy EAndy E 300k7575 gold badges456456 silver badges436436 bronze badges ...
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How to see indexes for a database or table in MySQL?

... answered Mar 6 '11 at 20:59 Mark ByersMark Byers 683k155155 gold badges14681468 silver badges13881388 bronze badges ...
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How do you crash a JVM?

I was reading a book on programming skills wherein the author asks the interviewee, "How do you crash a JVM?" I thought that you could do so by writing an infinite for-loop that would eventually use up all the memory. ...
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Coding Conventions - Naming Enums

... gsamaras 64.5k3131 gold badges140140 silver badges240240 bronze badges answered Jun 18 '10 at 13:13 DJClayworthDJC...