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Is there any boolean type in Oracle databases?
...read on asktom. From recommending CHAR(1) 'Y'/'N' they switch to NUMBER(1) 0/1 when someone points out that 'Y'/'N' depends on the English language, while e.g. German programmers might use 'J'/'N' instead.
The worst thing is that they defend this stupid decision just like they defend the ''=NULL st...
What's the best way to check if a String represents an integer in Java?
...ncerned with potential overflow problems this function will perform about 20-30 times faster than using Integer.parseInt().
public static boolean isInteger(String str) {
if (str == null) {
return false;
}
int length = str.length();
if (length == 0) {
return false;
...
UITableView load more when scrolling to bottom like Facebook application
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103
You can do that by adding a check on where you're at in the cellForRowAtIndexPath: method. This...
Relative frequencies / proportions with dplyr
...n = n()) %>%
mutate(freq = n / sum(n))
# am gear n freq
# 1 0 3 15 0.7894737
# 2 0 4 4 0.2105263
# 3 1 4 8 0.6153846
# 4 1 5 5 0.3846154
From the dplyr vignette:
When you group by multiple variables, each summary peels off one level of the grouping. That makes ...
Convert string with commas to array
... JSON.parse("[" + string + "]");
This gives you an Array of numbers.
[0, 1]
If you use .split(), you'll end up with an Array of strings.
["0", "1"]
Just be aware that JSON.parse will limit you to the supported data types. If you need values like undefined or functions, you'd need to use ...
typedef fixed length array
...
answered Dec 24 '10 at 0:44
R.. GitHub STOP HELPING ICER.. GitHub STOP HELPING ICE
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How to get execution time in rails console?
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edited Jul 20 '19 at 4:28
Jeremy Baker
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How to return an array from JNI to Java?
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120
If you've examined the documentation and still have questions that should be part of your initia...
How to quit scala 2.11.0 REPL?
In the last version of scala (2.10.3) REPL, I can type exit to quit from REPL. However, in Scala 2.11.0 this doesn't work.
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Controlling maven final name of jar artifact
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303
You set the finalName property in the plugin configuration section:
<plugin>
<gro...