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get size of json object
...If you execute the above statements, it will give you an error 'Unexpected token o in Json'. For calculating the length of json you can directly do var length= Object.keys(json).length.
– Aayushi
Jul 16 '17 at 18:03
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Split string into an array in Bash
...NU version of the manual does slightly better, since it opts for the word "tokens" instead of "words" in the first sentence of the Expansion section:
Expansion is performed on the command line after it has been split into tokens.
The important point is, $IFS does not change the way bash parses...
Why can't a text column have a default value in MySQL?
...ocs:
Each BLOB or TEXT value is represented internally by a separately allocated object. This is in contrast to all other data types, for which storage is allocated once per column when the table is opened.
It seems like pre-filling these column types would lead to memory usage and performance...
How to find the 'sizeof' (a pointer pointing to an array)?
... which is to stash the size somewhere. For example, if you're dynamically allocating the array, allocate a block one int bigger than the one you need, stash the size in the first int, and return ptr+1 as the pointer to the array. When you need the size, decrement the pointer and peek at the stashe...
String concatenation vs. string substitution in Python
...-squared. Some languages will optimize concatenation to the most recently allocated string, but it's risky to count on the compiler to optimize your quadratic algorithm down to linear. Best to use the primitive (join?) that takes an entire list of strings, does a single allocation, and concatenate...
Mix Razor and Javascript code
...
It returns Uncaught SyntaxError: Unexpected token & because the model becomes something like this [{"Id":1,"Name":"Name}]
– Weihui Guo
Feb 4 '19 at 15:33
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Multi-line strings in PHP
...owdoc syntax.
$var is NOT replaced in a nowdoc.
EOD;
Beware that the end token EOD must not be indented at all, or PHP won't acknowledge it. Also, you don't have to use "EOD"; it can be any string you want.
share
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Change UICollectionViewCell size on different device orientations
...ically in -viewDidLoad
self.portraitLayout = [[UICollectionViewFlowLayout alloc] init];
self.landscapeLayout = [[UICollectionViewFlowLayout alloc] init];
UIInterfaceOrientation orientationOnLunch = [[UIApplication sharedApplication] statusBarOrientation];
if (UIInterfaceOrientationIsPortrait(orie...
Iteration over std::vector: unsigned vs signed index variable
...yClass]’
instantiated from here
dependent-name ‘std::vector<T*,std::allocator<T*> >::iterator’ is parsed as a non-type, but instantiation yields a type
note: say ‘typename std::vector<T*,std::allocator<T*> >::iterator’ if a type is meant
The solution is using the ...
jquery IDs with spaces
...or this is simple, space character is not a valid for ID attribute.
ID tokens must begin with a letter
([A-Za-z]) and may be followed by any
number of letters, digits ([0-9]),
hyphens ("-"), underscores ("_"),
colons (":"), and periods (".").
But if you don't care about standards try $...