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PHP check whether property exists in object or class
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@b_dubb no, empty array, 0, false, null, '' all return true by `empty()'
– Peter
Jan 21 '19 at 20:26
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Iterate over object keys in node.js
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What you want is lazy iteration over an object or array. This is not possible in ES5 (thus not possible in node.js). We will get this eventually.
The only solution is finding a node module that extends V8 to implement iterators (and probably generators). I couldn't find any...
What does 'predicate' mean in the context of computer science? [duplicate]
... some condition.
it's used as a "filter criteria" meaning
lets consider an array of numbers and a predicate that returns true if number > 0 , false other wise .
function predicate(number){
return number > 0
}
// array of numbers
var numbers = [-2 , -1 , 0 , 1 , 2];
var newNumbers = number...
How do I create a PDO parameterized query with a LIKE statement?
...>prepare('SELECT * FROM table WHERE column LIKE ?');
$query->execute(array('value%'));
while ($results = $query->fetch())
{
echo $results['column'];
}
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improve this answer
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How to convert a List into a comma separated string without iterating List explicitly [dupli
... idList but it does not appear in your code:
List<String> ids = new ArrayList<String>();
ids.add("1");
ids.add("2");
ids.add("3");
ids.add("4");
String idList = ids.toString();
String csv = idList.substring(1, idList.length() - 1).replace(", ", ",");
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Android- create JSON Array and JSON Object
...his format in Android:
Since the API that I will be passing will parse JsonArray then the object.
Or would it be okay if just to pass a json object? Since I will just have to insert 1 transaction per service call.
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Javascript : natural sort of alphanumerical strings
I'm looking for the easiest way to sort an array that consists of numbers and text, and a combination of these.
7 Answers
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When should I use malloc in C and when don't I?
...d
some_memory = (char *)malloc(size_to_allocate);
is allocating a char array ( a variable) and some_memory points to that allocated memory. Now this array is both read and write. You can now do:
some_memory[0] = 'h';
and the array contents change to "hello World"
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Any equivalent to .= for adding to beginning of string in PHP?
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/* string(6) "barfoobar" */
I normally use vsprintf, since working with arrays is easier to manage value positions than individual arguments.
$vprepend = vsprintf('%2$s%1$s', array('foo', 'bar'));
var_dump($vprepend);
/* string(6) "barfoo" */
Also with an array of values, one can simply implod...
Algorithm to return all combinations of k elements from n
I want to write a function that takes an array of letters as an argument and a number of those letters to select.
71 Answe...