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How do I check in JavaScript if a value exists at a certain array index?
...y, arrays in JavaScript contain array.length elements, starting with array[0] up until array[array.length - 1]. An array element with index i is defined to be part of the array if i is between 0 and array.length - 1 inclusive. If i is not in this range it's not in the array.
So by concept, arrays...
Is it valid to have a tag inside another tag?
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10
Yes, since a website is generally divided into one or more sections, use it as long as you feel ...
Create empty queryset by default in django form fields
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marianobianchimarianobianchi
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What's the need of array with zero elements?
...lloc(sizeof(*var) + extra);
You can access var->data with indices in [0, extra). Note that sizeof(struct something) will only give the size accounting for the other variables, i.e. gives data a size of 0.
It may be interesting also to note how the standard actually gives examples of mallocin...
What exactly is Arel in Rails 3.0?
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What exactly is Arel in Rails 3.0?
It's an object model for an algebra of relational query operators.
I understand that it is a replacement for ActiveRecord
No, it isn't. It's a replacement for hand-crafting SQL queries in strings. It is a common query l...
How to get an array of specific “key” in multidimensional array without looping
...ap(function ($ar) {return $ar['id'];}, $users);
Before(Technically php 4.0.6+), you must create an anonymous function with create_function instead:
$ids = array_map(create_function('$ar', 'return $ar["id"];'), $users);
s...
$watch'ing for data changes in an Angular directive
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edited Apr 24 '15 at 10:39
answered Dec 20 '12 at 21:47
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How do I run multiple instances of Android Studio
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answered Aug 18 '13 at 19:20
Grzegorz ŻurGrzegorz Żur
38.5k1313 gold badges9696 silver badges9191 bronze badges
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Does constexpr imply inline?
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140
Yes ([dcl.constexpr], §7.1.5/2 in the C++11 standard): "constexpr functions and constexpr const...
Determine if $.ajax error is a timeout
...: "/ajax_json_echo/",
type: "GET",
dataType: "json",
timeout: 1000,
success: function(response) { alert(response); },
error: function(xmlhttprequest, textstatus, message) {
if(textstatus==="timeout") {
alert("got timeout");
} else {
alert(t...