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Check if an array is empty or exists
... image_array.length > 0) {
// the array is defined and has at least one element
}
Your problem may be happening due to a mix of implicit global variables and variable hoisting. Make sure you use var whenever declaring a variable:
<?php echo "var image_array = ".json_encode($images);?>...
Why do you use typedef when declaring an enum in C++?
...ced to declare your variable like this:
enum TokenType my_type;
As mentioned by others, this doesn't make a difference in C++. My guess is that either the person who wrote this is a C programmer at heart, or you're compiling C code as C++. Either way, it won't affect the behaviour of your code.
...
How to append to a file in Node?
...
Does anyone know if fs.appendFile keeps a link to the file open so appends are faster? (rather than open/close each write) nodejs.org/api/…
– nelsonic
Oct 30 '12 at 14:16
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Readonly Properties in Objective-C?
...tomic, readonly) NSString* foo;
In the implementation .m file:
// inside one of my init methods
self->_foo = @"someString"; // Notice the underscore prefix of var name.
That’s it, that’s all you need. No muss, no fuss.
Details
As of Xcode 4.4 and LLVM Compiler 4.0 (New Features in Xcode...
How to pass parameters on onChange of html select
I am a novice at JavaScript and jQuery. I want to show one combobox-A, which is an HTML <select> with its selected id and contents at the other place on onChange().
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How do you dismiss the keyboard when editing a UITextField
...the keyboard, but I'm not sure how to know when the user has pressed the "Done" key on the keyboard. Is there a notification I can watch for?
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Permanently add a directory to PYTHONPATH?
...did not work because my repos directory did not have _init_.py. Going down one directory further: /Users/joey/repos/specificRepo did the trick. Now python can traverse any downward directory connected to the specificRepo directory that contains a init.py !
– Qiao Yi
...
How to cancel/abort jQuery AJAX request?
...tate of the request(UNSENT-0, OPENED-1, HEADERS_RECEIVED-2, LOADING-3 and DONE-4). we can use this to check whether the previous request was completed.
$(document).ready(
var xhr;
var fn = function(){
if(xhr && xhr.readyState != 4){
xhr.abort();
}
...
Static variable inside of a function in C
...e compiler (essentially) 'hey, I have a variable here that I don't want anyone else accessing, don't tell anyone else it exists'.
Inside a method, the static keyword tells the compiler the same as above, but also, 'don't tell anyone that this exists outside of this function, it should only be acces...
How do I create a multiline Python string with inline variables?
...sn't really the same because the OP wants named parameters, not positional ones.
– Ismail Badawi
Apr 11 '12 at 19:33
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