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How to test if parameters exist in rails
...re asking about existence. You might need to differentiate:
Not there at all.
There but nil.
There but false.
There but an empty string.
as well. Hard to say without more details of your precise situation.
share
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How do you follow an HTTP Redirect in Node.js?
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It is. It's called http.request the API is pretty simple.
– Raynos
Oct 23 '12 at 20:24
3
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How to get the Android device's primary e-mail address
...ntManager.getAccounts or AccountManager.getAccountsByType to get a list of all account names on the device. Fortunately, for certain account types (including com.google), the account names are email addresses. Example snippet below.
Pattern emailPattern = Patterns.EMAIL_ADDRESS; // API level 8+
Acc...
Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
... interesting job interview experience a while back. The question started really easy:
47 Answers
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Why should I learn Lisp? [closed]
I really feel that I should learn Lisp and there are plenty of good resources out there to help me do it.
29 Answers
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How do I check if a type provides a parameterless constructor?
...Type.EmptyTypes, null);
There's a caveat for value types, which aren't allowed to have a default constructor. You can check if you have a value type using the Type.IsValueType property, and create instances using Activator.CreateInstance(Type);
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How to break out of multiple loops?
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Its usually possible to refactor the inner loop into its own method, that returns true to continue, false to break the outer loop. while condition1: / if not MyLoop2(params): break. An alternative is to set a boolean flag, that is ...
OnChange event handler for radio button (INPUT type=“radio”) doesn't work as one value
... It would be better to cache the function outside the loop, so that all radios share the same event handler (now they have identical handlers but they are different functions). Or maybe put all radios inside a wrapper and use event delegation
– Oriol
Aug...
How can I split a text into sentences?
...sentence_terminator in sentence_terminators:
t_indices = list(find_all(paragraph, sentence_terminator))
possible_endings.extend(([] if not len(t_indices) else [[i, len(sentence_terminator)] for i in t_indices]))
for contraction in contractions:
c_indices = list(find_all(p...
How can I add an item to a IEnumerable collection?
...s can be added. In fact, it does not necessarily represent a collection at all! For example:
IEnumerable<string> ReadLines()
{
string s;
do
{
s = Console.ReadLine();
yield return s;
} while (!string.IsNullOrEmpty(s));
}
IEnumerable<string> lines ...