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What is a NullReferenceException, and how do I fix it?
...r just as normal via a. Note that accessing it via a.Value throws an InvalidOperationException instead of a NullReferenceException if a is null - you should do the check beforehand, i.e. if you have another on-nullable variable int b; then you should do assignments like if (a.HasValue) { b = a.Value...
How do I split a multi-line string into multiple lines?
I have a multi-line string literal that I want to do an operation on each line, like so:
6 Answers
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Integer.toString(int i) vs String.valueOf(int i)
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Just two different ways of doing the same thing. It may be a historical reason (can't remember if one came before the other).
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submitting a GET form with query string params and hidden params disappear
... HTML 4.01, the spec produces invalid URIs - most browsers didn't actually do this though..
See http://www.w3.org/TR/html401/interact/forms.html#h-17.13.3, step four - the URI will have a ? appended, even if it already contains one.
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How do I get a reference to the app delegate in Swift?
How do I get a reference to the app delegate in Swift?
18 Answers
18
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How to set a Django model field's default value to a function call / callable (e.g., a date relative
... default value is not recommended (c.f. @stvnw comment). The proper way to do this is to declare a function before the field and use it as a callable in default_value named arg:
from datetime import datetime, timedelta
# default to 1 day from now
def get_default_my_date():
return datetime.now() ...
Use of 'const' for function parameters
How far do you go with const ? Do you just make functions const when necessary or do you go the whole hog and use it everywhere? For example, imagine a simple mutator that takes a single boolean parameter:
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How do I iterate over a JSON structure? [duplicate]
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Taken from jQuery docs:
var arr = [ "one", "two", "three", "four", "five" ];
var obj = { one:1, two:2, three:3, four:4, five:5 };
jQuery.each(arr, function() {
$("#" + this).text("My id is " + this + ".");
return (this != "four"); // wil...
abort, terminate or exit?
...ss and uploads the exception report for the developers' attention, like Windows Error Reporting, Mac OS X error reports and iPhone application error logs.
– JBRWilkinson
May 14 '10 at 9:42
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Why can't I save CSS changes in Firebug? [closed]
... it works great highlighting the changed lines. Just click Save and you're done! :)
Here's a video explaining this and much more: Google I/O 2011: Chrome Dev Tools Reloaded
I hope it helps if it doesn't matter to you changing browser while editing your CSS files. I made the change already for now,...