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Check image width and height before upload with Javascript

I have a JPS with a form in which a user can put an image: 8 Answers 8 ...
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How to create directories recursively in ruby?

I want to store a file as /a/b/c/d.txt, but I do not know if any of these directories exist and need to recursively create them if necessary. How can one do this in ruby? ...
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Build a Basic Python Iterator

How would one create an iterative function (or iterator object) in python? 10 Answers ...
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How to Replace dot (.) in a string in Java

I have a String called persons.name 4 Answers 4 ...
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How to use a variable for the key part of a map

Let's say I have 2 Answers 2 ...
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SVG Positioning

I'm having a play with SVG and am having a few problems with positioning. I have a series of shapes which are contained in the g group tag. I was hoping to use it like a container, so I could set its x position and then all the elements in that group would also move. But that doesn't seem to be po...
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Reference alias (calculated in SELECT) in WHERE clause

The calculated value BalanceDue that is set as a variable in the list of selected columns cannot be used in the WHERE clause. ...
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Does async(launch::async) in C++11 make thread pools obsolete for avoiding expensive thread creation

It is loosely related to this question: Are std::thread pooled in C++11? . Though the question differs, the intention is the same: ...
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Detecting if an NSString contains…?

How can I detect if a string contains a certain word? For example, I have a string below which reads: 7 Answers ...
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How do I clear this setInterval inside a function?

Normally, I’d set the interval to a variable and then clear it like var the_int = setInterval(); clearInterval(the_int); but for my code to work I put it in an anonymous function: ...