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Is there any way to use a numeric type as an object key?
...her subjective. As William noted, for integer keys you can instead use an array. Most JS engines can use sparse arrays behind the scenes.
– Matthew Flaschen
Sep 3 '10 at 6:18
7
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How do I create an empty array in YAML?
Is there any way to specify that empty_array: is an array with no elements, such as with [] ? When I load it into a ruby hash I'd like it to know that it's an array.
...
How to remove all subviews of a view in Swift?
...e
view.subviews.map({ $0.removeFromSuperview() }) // this returns modified array
^^ These features are fun!
let funTimes = ["Awesome","Crazy","WTF"]
extension String {
func readIt() {
print(self)
}
}
funTimes.forEach({ $0.readIt() })
//// END EDIT
Just do this:
for view in s...
Performance difference for control structures 'for' and 'foreach' in C#
..._0030: ret
} // end of method Test::IterateOverList
The compiler treats arrays differently, converting a foreach loop basically to a for loop, but not List<T>. Here's the equivalent code for an array:
static void IterateOverArray(object[] array)
{
foreach (object o in array)
{
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Can a pointer to base point to an array of derived objects?
...
You cannot index like that. You have allocated an array of Rectangles and stored a pointer to the first in shapes. When you do shapes[1] you're dereferencing (shapes + 1). This will not give you a pointer to the next Rectangle, but a pointer to what would be the next Shape i...
Converting timestamp to time ago in PHP e.g 1 day ago, 2 days ago…
...floor($diff->d / 7);
$diff->d -= $diff->w * 7;
$string = array(
'y' => 'year',
'm' => 'month',
'w' => 'week',
'd' => 'day',
'h' => 'hour',
'i' => 'minute',
's' => 'second',
);
foreach ($string as $...
Reference - What does this error mean in PHP?
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Notice: Undefined Index
Happens when you try to access an array by a key that does not exist in the array.
A typical example of an Undefined Index notice would be (demo)
$data = array('foo' => '42', 'bar');
echo $data['spinach'];
echo $data[1];
Both spinach and 1 do not exis...
How can I explode and trim whitespace?
For example, I would like to create an array from the elements in this string:
11 Answers
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What is the difference between .map, .every, and .forEach?
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The difference is in the return values.
.map() returns a new Array of objects created by taking some action on the original item.
.every() returns a boolean - true if every element in this array satisfies the provided testing function. An important difference with .every() is that ...
Correct way to find max in an Array in Swift
...function (here, it's anonymous) to the accumulator and each element of the array successively, and stores the new value in the accumulator. The last accumulator value is then returned.
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