What is “better” solely depends on your requirements: For instance String Builder will be faster, but the code will be much more unreadable, and and it would be easier to make a mistake. On the other hand String.format() produces more readable code at the cost of performance. JMH benchmark to illustrate the performance difference (notice … Read more
With java 8 you can now use Optional class for this: import static java.util.Optional.ofNullable; … String myString = null; System.out.printf(“myString: %s”, ofNullable(myString).orElse(“Not found”) );
There is another solution. Implement IFormatProvider to return a ICustomFormatter that will be passed to string.Format : public class StringPadder : ICustomFormatter { public string Format(string format, object arg, IFormatProvider formatProvider) { // do padding for string arguments // use default for others } } public class StringPadderFormatProvider : IFormatProvider { public object GetFormat(Type formatType) … Read more
Same way as with printf — use a – modifier in the format
I’m guessing here, but it looks to be the difference of which overloaded call you’re hitting; String.Format has multiple. In the first example, it would make sense you’re hitting String.Format(string,object). In the second example by providing null you’re most likely hitting String.Format(string,params object[]) which, per the documentation, would raise an ArgumentNullException when: format or args … Read more
As you may have worked out, it’s not necessary to specify the l flag. According to the docs, a decimal integer is specified by d just like in C++. So the answer is just %d.
NOTE: This answer was written when .NET 2.0 was the current version. This may no longer apply to later versions. String.Format uses a StringBuilder internally: public static string Format(IFormatProvider provider, string format, params object[] args) { if ((format == null) || (args == null)) { throw new ArgumentNullException((format == null) ? “format” : “args”); } … Read more
I can see a number of reasons: Readability string s = string.Format(“Hey, {0} it is the {1}st day of {2}. I feel {3}!”, _name, _day, _month, _feeling); vs: string s = “Hey,” + _name + ” it is the ” + _day + “st day of ” + _month + “. I feel ” + … Read more
I’m amazed that so many people immediately want to find the code that executes the fastest. If ONE MILLION iterations STILL take less than a second to process, is this going to be in ANY WAY noticeable to the end user? Not very likely. Premature optimization = FAIL. I’d go with the String.Format option, only … Read more
The source code for ASP.NET AJAX is available for your reference, so you can pick through it and include the parts you want to continue using into a separate JS file. Or, you can port them to jQuery. Here is the format function… String.format = function() { var s = arguments[0]; for (var i = … Read more