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Hash function that produces short hashes?
...h and produce a sub-10-character hash? I want to produce reasonably unique ID's but based on message contents, rather than randomly.
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How to reshape data from long to wide format
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Using reshape function:
reshape(dat1, idvar = "name", timevar = "numbers", direction = "wide")
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How do I get the value of text input field using JavaScript?
...get an input textbox value directly (without wrapping the input element inside a form element):
Method 1:
document.getElementById('textbox_id').value to get the value of
desired box
For example, document.getElementById("searchTxt").value;
Note: Method 2,3,4 and 6 returns a colle...
How do I check if a Sql server string is null or empty
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I couldn't decide if I should upvote your answer or unclefofa's, since he seems to have answered first, but his answer has been edited after you answered. I ended upvoting both.
– Zecc
Mar 22 '11 at 1...
How do I delete rows in a data frame?
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The key idea is you form a set of the rows you want to remove, and keep the complement of that set.
In R, the complement of a set is given by the '-' operator.
So, assuming the data.frame is called myData:
myData[-c(2, 4, 6), ] ...
Unable to simultaneously satisfy constraints, will attempt to recover by breaking constraint
... find UIView and NSLayoutConstraint in red rectangles. Since we know their id in memory it is quite easy.
Stop app using Debug View Hierarchy:
Find the proper UIView:
The next is to find NSLayoutConstraint we care about:
As you can see, the memory pointers are the same. So we know wh...
Mismatched anonymous define() module
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Like AlienWebguy said, per the docs, require.js can blow up if
You have an anonymous define ("modules that call define() with no string ID") in its own script tag (I assume actually they mean anywhere in global scope)
You have modules that ha...
How to remove “onclick” with JQuery?
.... with the selector you need.)
// use the "[attr=value]" syntax to avoid syntax errors with special characters (like "$")
$('[id="a$id"]').prop('onclick',null).off('click');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<a id="a$...
What is “android.R.layout.simple_list_item_1”?
I've started learning Android development and am following a todolist example from a book:
7 Answers
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Design Pattern for Undo Engine
...this once and it worked very slick. The biggest thing you have to do is avoid the direct use of pointers or references in the model.
Every reference to another object uses some identifier (like an integer). Whenever the object is needed, you lookup the current definition of the object from a table....