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Testing for empty or nil-value string [duplicate]
I'm trying to set a variable conditionally in Ruby. I need to set it if the variable is nil or empty (0 length string). I've come up with the following:
...
What does the star operator mean, in a function call?
...ou want to 'store' a function call.
For example, suppose I have some unit tests for a function 'add':
def add(a, b): return a + b
tests = { (1,4):5, (0, 0):0, (-1, 3):3 }
for test, result in tests.items():
print 'test: adding', test, '==', result, '---', add(*test) == result
There is no other...
jQuery validate: How to add a rule for regular expression validation?
...r re = new RegExp(regexp);
return this.optional(element) || re.test(value);
},
"Please check your input."
);
now all you need to do to validate against any regex is this:
$("#Textbox").rules("add", { regex: "^[a-zA-Z'.\\s]{1,40}$" })
Additionally, it looks like there...
Determine if running on a rooted device
...uild.TAGS;
return buildTags != null && buildTags.contains("test-keys");
}
private static boolean checkRootMethod2() {
String[] paths = { "/system/app/Superuser.apk", "/sbin/su", "/system/bin/su", "/system/xbin/su", "/data/local/xbin/su", "/data/local/bin/su", "/syste...
How to test if one java class extends another at runtime?
How to I test if a is a subclass of b ?
3 Answers
3
...
Insert text with single quotes in PostgreSQL
I have a table test(id,name) .
7 Answers
7
...
Select first row in each GROUP BY group?
...Example.
If total can be NULL, you most probably want the row with the greatest non-null value. Add NULLS LAST like demonstrated. See:
Sort by column ASC, but NULL values first?
The SELECT list is not constrained by expressions in DISTINCT ON or ORDER BY in any way. (Not needed in the simple case ...
How do you UrlEncode without using System.Web?
... as an answer.
Couldn't find any good examples comparing them so:
string testString = "http://test# space 123/text?var=val&another=two";
Console.WriteLine("UrlEncode: " + System.Web.HttpUtility.UrlEncode(testString));
Console.WriteLine("EscapeUriString: " + Uri.EscapeUriString(testSt...
Escape angle brackets in a Windows command prompt
...etlocal disableDelayedExpansion
set "line=<html>"
cmd /v:on /c echo !test!|findstr .
Note that delayed expansion is OFF in the parent batch script.
But all hell breaks loose if delayed expansion is enabled in the parent script. The following does not work:
@echo off
setlocal enableDelayedE...