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Recommended way of making React component/div draggable
I want to make a draggable (that is, repositionable by mouse) React component, which seems to necessarily involve global state and scattered event handlers. I can do it the dirty way, with a global variable in my JS file, and could probably even wrap it in a nice closure interface, but I want to kno...
Adding one day to a date
My code to add one day to a date returns a date before day adding:
2009-09-30 20:24:00 date after adding one day SHOULD be rolled over to the next month: 1970-01-01 17:33:29
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How to sort strings in JavaScript
I have a list of objects I wish to sort based on a field attr of type string. I tried using -
11 Answers
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Pointers in C: when to use the ampersand and the asterisk?
I'm just starting out with pointers, and I'm slightly confused. I know & means the address of a variable and that * can be used in front of a pointer variable to get the value of the object that is pointed to by the pointer. But things work differently when you're working with arrays, string...
What's the syntax for mod in java
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Instead of the modulo operator, which has slightly different semantics, for non-negative integers, you can use the remainder operator %. For your exact example:
if ((a % 2) == 0)
{
isEven = true;
}
else
{
isEven = false;
}
This can be simplified to a one-liner:
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getting the X/Y coordinates of a mouse click on an image with jQuery [duplicate]
I would like to use jQuery to get the X/Y coordinates of a click event on an image. The coordinates should be relative to the image, not relative to the whole page
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urlencode vs rawurlencode?
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It will depend on your purpose. If interoperability with other systems is important then it seems rawurlencode is the way to go. The one exception is legacy systems which expect the query string to follow form-encoding style of spaces encoded ...
Convert a matrix to a 1 dimensional array
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Either read it in with 'scan', or just do as.vector() on the matrix. You might want to transpose the matrix first if you want it by rows or columns.
> m=matrix(1:12,3,4)
> m
[,1] [,2] [,3] [,4]
[1,] 1 4 7 10
[2,] 2 5 8 11
[3,] 3 6 9 12
> as.vect...
Pandas index column title or name
How do I get the index column name in python pandas? Here's an example dataframe:
9 Answers
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What's the best way to set a single pixel in an HTML5 canvas?
The HTML5 Canvas has no method for explicitly setting a single pixel.
14 Answers
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