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Database Design for Revisions?
...ey field of the table being updated. If it's a combined key, we just do a string concatenation with a '~' between the fields.
I'm sure this system may have drawbacks - for heavily updated databases the performance may be hit, but for my web-app, we get many more reads than writes and it seems to b...
How can I replace a regex substring match in Javascript?
That replaces the entire string str with 1 . I want it to replace the matched substring instead of the whole string. Is this possible in Javascript?
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Rails 3.1 and Image Assets
... Rails 'helps you out' by putting in the url keyword as well as the string. This means that you can do things like. div.logo {background: image-url("logo.png") no-repeat center;}
– Antony Denyer
Apr 29 '16 at 17:39
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Max retries exceeded with URL in requests
... was specified in hints.ai_flags and service was not a numeric port-number string. It probably looked like the sleep fixed it, but you probably just slept through a transient DNS resolver issue.
– lingfish
Jun 6 '17 at 23:13
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Is there a literal notation for an array of symbols?
I like this literal expression for an array of strings:
2 Answers
2
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What is the difference between object keys with quotes and without quotes?
...ce those are reserved keywords.
Some people might be tempted to pass in a string with whitespace then call o['I can have whitespace'] But I would call that bad practice.
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How to pass command line argument to gnuplot?
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@Chong: Either string them together or give each one in an -e argument, e.g. -e "filename='default.data'; foo='bar'" or -e "filename='default.data'" -e "foo='bar"'.
– Thor
Feb 2 '16 at 16:37
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从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
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final static int RECOMMENDER_NUM = 3;
public static void main(String[] args) throws IOException, TasteException {
String file = "datafile/item.csv";
DataModel model = new FileDataModel(new File(file));
UserSimilarity user = new EuclideanDistanceSimilarity(mode...
What does the ^ operator do in Java?
...nother question where the intention was to use exponentiation to convert a string "8675309" to int without using Integer.parseInt as a programming exercise (^ denotes exponentiation from now on). The OP's intention was to compute 8*10^6 + 6*10^5 + 7*10^4 + 5*10^3 + 3*10^2 + 0*10^1 + 9*10^0 = 867530...
Visual Studio - Resx File default 'internal' to 'public'
...("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
internal Strings() {
}
The derived class:
public class PublicStrings : Strings
{
/// <summary>
/// Public localization Strings.
/// </summary>
public PublicStrings()
{
}
}
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