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What is the difference between null and undefined in JavaScript?
I want to know what the difference is between null and undefined in JavaScript.
33 Answers
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How do I write stderr to a file while using “tee” with a pipe?
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I'm assuming you want to still see STDERR and STDOUT on the terminal. You could go for Josh Kelley's answer, but I find keeping a tail around in the background which outputs your log file very hackish and cludgy. Notice how you need to keep an exra FD and do cleanu...
How to use R's ellipsis feature when writing your own function?
...nts. For example, the function data.frame takes any number of arguments, and each argument becomes the data for a column in the resulting data table. Example usage:
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How to check all checkboxes using jQuery?
... work good but in my app i have one fake check. when i refresh page ctrl+r and click on checkbox checkAll he dont check me all. After that i must check again to be successfull. So i need 2x click on checkAll whay that dont work on single click(one)? I copy paste that code and make function checkAll(...
HTML 5: Is it , , or ?
...atibility with XHTML; to make it possible to write the same code as XHTML, and have it also work as HTML. Some systems that generate HTML may be based on XML generators, and thus do not have the ability to output just a bare <br> tag; if you're using such a system, it's fine to use <br/>...
Access index of the parent ng-repeat from child ng-repeat
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My example code was correct and the issue was something else in my actual code. Still, I know it was difficult to find examples of this so I'm answering it in case someone else is looking.
<div ng-repeat="f in foos">
<div>
<div ng-...
AngularJS : Why ng-bind is better than {{}} in angular?
I was in one of the angular presentation and one of the person in the meeting mentioned ng-bind is better than {{}} binding.
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Rails :include vs. :joins
... that requires it. In some cases, you know the join will be more efficient and will not incur the risk of duplication.
– Jonathan Swartz
Nov 21 '13 at 0:28
1
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How to hide a in a menu with CSS?
...: none. FF won't do it (technically invalid HTML, per the spec) but Chrome and IE will and it will hide the option.
EDIT: Oh yeah, I already implemented this in jQuery:
jQuery.fn.toggleOption = function( show ) {
jQuery( this ).toggle( show );
if( show ) {
if( jQuery( this ).parent...
SEH stack 结构探索（1）--- 从 SEH 链的最底层（线程第1个SEH结构）说起 -...
...ff call ntdll32!_SEH_prolog4 (772ddd24)
772e9d27 8365fc00 and dword ptr [ebp-4],0
772e9d2b a124423b77 mov eax,dword ptr [ntdll32!Kernel32ThreadInitThunkFunction (773b4224)]
772e9d30 ff750c push dword ptr [ebp+0Ch]
772e9d33 85c0 test eax,e...