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Test if string is a number in Ruby on Rails
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Create is_number? Method.
Create a helper method:
def is_number? string
true if Float(string) rescue false
end
And then call it like this:
my_string = '12.34'
is_number?( my_string )
# => true
Extend String Class.
If you want to be able to call is_number? directly on the string...
Converting JSON data to Java object
I want to be able to access properties from a JSON string within my Java action method. The string is available by simply saying myJsonString = object.getJson() . Below is an example of what the string can look like:
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Can I replace groups in Java regex?
...(...). I'm assuming you wanted to replace the first group with the literal string "number" and the second group with the value of the first group.
Pattern p = Pattern.compile("(\\d)(.*)(\\d)");
String input = "6 example input 4";
Matcher m = p.matcher(input);
if (m.find()) {
// replace first nu...
.NET NewtonSoft JSON deserialize map to a different property name
I have following JSON string which is received from an external party.
5 Answers
5
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Given a DateTime object, how do I get an ISO 8601 date in string format?
...). Refer to the comments section for more information.
DateTime.UtcNow.ToString("yyyy-MM-ddTHH\\:mm\\:ss.fffffffzzz");
This gives you a date similar to 2008-09-22T13:57:31.2311892-04:00.
Another way is:
DateTime.UtcNow.ToString("o");
which gives you 2008-09-22T14:01:54.9571247Z
To get the s...
Lambda expression to convert array/List of String to array/List of Integers
...p(func).toArray(generator);
}
And use it like this:
//for lists
List<String> stringList = Arrays.asList("1","2","3");
List<Integer> integerList = convertList(stringList, s -> Integer.parseInt(s));
//for arrays
String[] stringArr = {"1","2","3"};
Double[] doubleArr = convertArray(s...
'str' object does not support item assignment in Python
I would like to read some characters from a string and put it into other string (Like we do in C).
7 Answers
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How to programmatically display version/build number of target in iOS app?
... minor incremental changes.
To get the version number:
Objective-C:
NSString * appVersionString = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"];
Swift < 3.0:
let appVersionString: String = NSBundle.mainBundle().objectForInfoDictionaryKey("CFBundleShortVe...
Passing multiple variables in @RequestBody to a Spring MVC controller using Ajax
...pping(value = "/Test", method = RequestMethod.POST)
public boolean getTest(String str1, String str2)
First define a custom annotation, say @JsonArg, with the JSON path like path to the information that you want:
public boolean getTest(@JsonArg("/str1") String str1, @JsonArg("/str2") String str2)
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Count all occurrences of a string in lots of files with grep
I have a bunch of log files. I need to find out how many times a string occurs in all files.
15 Answers
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