大约有 13,916 项符合查询结果（耗时：0.0244秒） [XML]
Default value of BOOL
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There is no default value if you write
-(void)somemethod {
BOOL x; // <--- no default value
It is initialized to garbage.
However, for a BOOL ivar, it will be initialized to NO, as the whole instance is filled with 0 on initialization.
(Note: When ARC is enabled, local object poin...
CORS - How do 'preflight' an httprequest?
...o acknowledge these headers in order for the actual request to work.
For example, suppose the browser makes a request with the following headers:
Origin: http://yourdomain.com
Access-Control-Request-Method: POST
Access-Control-Request-Headers: X-Custom-Header
Your server should then respond with...
What is self-documenting code and can it replace well documented code? [closed]
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How does functools partial do what it does?
...yword args support etc):
def partial(func, *part_args):
def wrapper(*extra_args):
args = list(part_args)
args.extend(extra_args)
return func(*args)
return wrapper
So, by calling partial(sum2, 4) you create a new function (a callable, to be precise) that behaves li...
What’s the difference between “Array()” and “[]” while declaring a JavaScript array?
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There is a difference, but there is no difference in that example.
Using the more verbose method: new Array() does have one extra option in the parameters: if you pass a number to the constructor, you will get an array of that length:
x = new Array(5);
alert(x.length); // 5
To il...
How can I update NodeJS and NPM to the next versions?
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JSON datetime between Python and JavaScript
... json.dumps won't know how to convert those either, but the exception is being supressed. Sadly a one line lambda fix has it's shortcomings. If you would rather have an exception raised on the unknowns (which is a good idea) use the function I've added above.
– ...
How to perform a mysqldump without a password prompt?
... any other user on the system while the dump is running, with a simple ps ax command.
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html5 localStorage error with Safari: “QUOTA_EXCEEDED_ERR: DOM Exception 22: An attempt was made to
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Apparently this is by design. When Safari (OS X or iOS) is in private browsing mode, it appears as though localStorage is available, but trying to call setItem throws an exception.
store.js line 73
"QUOTA_EXCEEDED_ERR: DOM Exception 22: An attempt was made to add someth...
How to wait for a keypress in R?
... how about adding one more feature to it? press esc keep to exit loop ?
– I_m_LeMarque
Mar 21 '18 at 18:59
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