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How to use Jackson to deserialise an array of objects
...supports deserialising "Arrays of all supported types" but I can't figure out the exact syntax for this.
8 Answers
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UnicodeDecodeError: 'charmap' codec can't decode byte X in position Y: character maps to
...CP1252 encoding. It's using another encoding. Which one you have to figure out yourself. Common ones are Latin-1 and UTF-8. Since 0x90 doesn't actually mean anything in Latin-1, UTF-8 (where 0x90 is a continuation byte) is more likely.
You specify the encoding when you open the file:
file = open(f...
Array or List in Java. Which is faster?
.... I am working on a problem at the moment where someone used an int throughout for a key in a map (to save space/time). We now need to change all lines to a new object - its painful.
– Fortyrunner
Apr 4 '09 at 19:30
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How do I check if a column is empty or null in MySQL?
...''
Since null > '' produces unknown, this has the effect of filtering out both null and empty strings.
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JOIN queries vs multiple queries
...ds on a lot of things. Jeff Atwood (founder of this site) actually wrote about this. For the most part, though, if you have the right indexes and you properly do your JOINs it is usually going to be faster to do 1 trip than several.
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How to get the next auto-increment id in mysql
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@Sarfraz: The question was about the NEXT id not the LAST as you said mentioning LAST_INSERT_ID().
– Felipe Pereira
Jan 19 '17 at 14:44
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How to “properly” create a custom object in JavaScript?
I wonder about what the best way is to create an JavaScript object that has properties and methods.
15 Answers
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Are there any CSV readers/writer libraries in C#? [closed]
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Is there a way to use this library without a custom type so that I can just iterate through my table grid (custom) and write out header and then pass each row field? I'm just looking for a way to prevent errors in the files (escaping properly etc).
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Find duplicate lines in a file and count how many time each line was duplicated?
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An additional step is to pipe the output of that into a final 'sort -n' command. That will sort the results by which lines occur most often.
– samoz
Jun 11 '14 at 18:24
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How is this fibonacci-function memoized?
...sk for its 100th element, xs!!99, the 100th slot in the list gets "fleshed out", holding the number 99 now, ready for next access.
That is what that trick, "going-through-a-list", is exploiting. In normal doubly-recursve Fibonacci definition, fib n = fib (n-1) + fib (n-2), the function itself gets...