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How can I check for “undefined” in JavaScript? [duplicate]
...ariable has been declared regardless of its value, then using the in operator is the safest way to go. Consider this example:
// global scope
var theFu; // theFu has been declared, but its value is undefined
typeof theFu; // "undefined"
But this may not be the intended result for some cases, sinc...
How do we control web page caching, across all browsers?
... shown us that not all browsers respect the HTTP cache directives in a uniform manner.
29 Answers
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How to get pixel data from a UIImage (Cocoa Touch) or CGImage (Core Graphics)?
I have a UIImage (Cocoa Touch). From that, I'm happy to get a CGImage or anything else you'd like that's available. I'd like to write this function:
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Fastest way to determine if an integer's square root is an integer
I'm looking for the fastest way to determine if a long value is a perfect square (i.e. its square root is another integer):
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Does IMDB provide an API? [closed]
I recently found a movie organizer application which fetches its data from the IMDB database .
19 Answers
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Difference between TCP and UDP?
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TCP is a connection oriented stream over an IP network. It guarantees that all sent packets will reach the destination in the correct order. This imply the use of acknowledgement packets sent back to the sender, and automatic retransmission, cau...
How to detect the physical connected state of a network cable/connector?
In a Linux environment, I need to detect the physical connected or disconnected state of an RJ45 connector to its socket. Preferably using BASH scripting only.
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Is there a difference between YES/NO,TRUE/FALSE and true/false in objective-c?
...een these values (and is there a difference between BOOL and bool)? A co-worker mentioned that they evaluate to different things in Objective-C, but when I looked at the typedefs in their respective .h files, YES/TRUE/true were all defined as 1 and NO/FALSE/false were all defined as 0 . Is there...
Map vs Object in JavaScript
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According to mozilla:
A Map object can iterate its elements in insertion order - a for..of loop will return an array of [key, value] for each iteration.
and
Objects are similar to Maps in that both let you set keys to ...
A regex to match a substring that isn't followed by a certain other substring
...------------------
.* any character except \n (0 or more times
(matching the most amount possible))
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bar 'bar'
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