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When is null or undefined used in JavaScript? [duplicate]
...various scenarios:
You declare a variable with var but never set it.
var foo;
alert(foo); //undefined.
You attempt to access a property on an object you've never set.
var foo = {};
alert(foo.bar); //undefined
You attempt to access an argument that was never provided.
function myFunction (fo...
Difference in make_shared and normal shared_ptr in C++
...
The difference is that std::make_shared performs one heap-allocation, whereas calling the std::shared_ptr constructor performs two.
Where do the heap-allocations happen?
std::shared_ptr manages two entities:
the control block (stores meta data such as ref-counts, type-erased del...
jQuery's .click - pass parameters to user function
... the following example:
function myHandler( event ) {
alert( event.data.foo );
}
$( "p" ).on( "click", { foo: "bar" }, myHandler );
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Return array in a function
...
In this case, your array variable arr can actually also be treated as a pointer to the beginning of your array's block in memory, by an implicit conversion. This syntax that you're using:
int fillarr(int arr[])
Is kind of just syntactic sugar. You could really repla...
How to specify test directory for mocha?
...le hierarchy than the rest of the tests, and would only find that one odd ball file and not the dozen others that lived on the same level in the hierarchy. Wrapping in quotes fixed it.
– Stoutie
Nov 9 '15 at 0:23
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Really Cheap Command-Line Option Parsing in Ruby
...m afraid. When you look at the alternatives: [1] [2] [3], for what is basically just processing a simple string array (no really, let that sink in), you can't help but wonder WHY? What do you gain from all that bloat? This is not C, where strings are, "problematic". Of course to each his own. :)
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What is the preferred syntax for initializing a dict: curly brace literals {} or the dict() function
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The first version is preferable:
It works for all kinds of keys, so you can, for example, say {1: 'one', 2: 'two'}. The second variant only works for (some) string keys. Using different kinds of syntax depending on the type of the keys would be an unnecessary inconsisten...
In Vim, is there a way to paste text in the search line?
I want to search for $maximumTotalAllowedAfterFinish and replace it with $minimumTotalAllowedAfterFinish . Instead of typing the long text:
...
Why can't overriding methods throw exceptions broader than the overridden method?
...tends A {
@Override
public void foo() throws SocketException {..} // allowed
@Override
public void foo() throws SQLException {..} // NOT allowed
}
SocketException extends IOException, but SQLException does not.
This is because of polymorphism:
A a = new B();
try {
a.foo();
} cat...
Return multiple values in JavaScript?
... second} = getValues();
* See this table for browser compatibility. Basically, all modern browsers aside from IE support this syntax, but you can compile ES6 code down to IE-compatible JavaScript at build time with tools like Babel.
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