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Code for a simple JavaScript countdown timer?

I want to use a simple countdown timer starting at 30 seconds from when the function is run and ending at 0. No milliseconds. How can it be coded? ...
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Getting Java version at runtime

...nical Articles J2SE SDK/JRE Version String Naming Convention Version 1.5.0 or 5.0? "J2SE also keeps the version number 1.5.0 (or 1.5) in some places that are visible only to developers, or where the version number is parsed by programs" "java.version system property" Version 1.6.0 Used by De...
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Renaming columns in pandas

...he .columns attribute: >>> df = pd.DataFrame({'$a':[1,2], '$b': [10,20]}) >>> df.columns = ['a', 'b'] >>> df a b 0 1 10 1 2 20 share | improve this answer ...
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What is q=0.5 in Accept* HTTP headers?

...y factor. It specifies what language the user would prefer, on a scale of 0 to 1, as can be seen from the HTTP/1.1 Specification, §14.4: Each language-range MAY be given an associated quality value which represents an estimate of the user's preference for the languages specified by that range. Th...
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Remove trailing zeros

...this, if the input IS a string? You can use one of these: string.Format("{0:G29}", decimal.Parse("2.0044")) decimal.Parse("2.0044").ToString("G29") 2.0m.ToString("G29") This should work for all input. Update Check out the Standard Numeric Formats I've had to explicitly set the precision specif...
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Find Oracle JDBC driver in Maven repository

...;/groupId> <artifactId>ojdbc14</artifactId> <version>10.2.0.3.0</version> ...and the URL to download the file which in this case is http://www.oracle.com/technology/software/tech/java/sqlj_jdbc/index.html. Once you've downloaded the JAR just add it to your computer repo...
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Explain the use of a bit vector for determining if all characters are unique

... 103 int checker is used here as a storage for bits. Every bit in integer value can be treated as a ...
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Detail change after Git pull

... 209 Suppose you're pulling to master. You can refer to the previous position of master by master@{1...
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How do I set a variable to the output of a command in Bash?

... vstepaniuk 27022 silver badges88 bronze badges answered Jan 10 '11 at 21:04 Andy LesterAndy Lester ...
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Cross-browser custom styling for file upload button [duplicate]

... label.myLabel input[type="file"] { position:absolute; top: -1000px; } /***** Example custom styling *****/ .myLabel { border: 2px solid #AAA; border-radius: 4px; padding: 2px 5px; margin: 2px; background: #DDD; display: inline-block; } .myLabel:hove...