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When does invoking a member function on a null instance result in undefined behavior?
...stand is why it's undefined behavior to dereference a null pointer. In C++03, there's actually a bit of ambiguity here.
Although "dereferencing a null pointer results in undefined behavior" is mentioned in notes in both §1.9/4 and §8.3.2/4, it's never explicitly stated. (Notes are non-normative.)...
Check if object value exists within a Javascript array of objects and if not add a new object to arr
...nst arr = [{ id: 1, username: 'fred' }, { id: 2, username: 'bill' }, { id: 3, username: 'ted' }];
function add(arr, name) {
const { length } = arr;
const id = length + 1;
const found = arr.some(el => el.username === name);
if (!found) arr.push({ id, username: name });
return arr...
Scala @ operator
...version of case x: Some.
– Theo
Mar 3 '10 at 13:22
2
This is also covered under "Variable binding...
Convert duration to hours:minutes:seconds (or similar) in Rails 3 or Ruby
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@Html.HiddenFor does not work on Lists in ASP.NET MVC
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Return first match of Ruby regex
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135
You could try variableName[/regular expression/]. This is an example output from irb:
irb(main...
What's the difference between io.sockets.emit and broadcast?
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Best way to pretty print a hash
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answered Jan 12 '12 at 21:35
PhrogzPhrogz
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Is there a way to rename an Xcode 4 scheme?
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Immutable array in Java
...st<Integer> items = Collections.unmodifiableList(Arrays.asList(0,1,2,3));
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