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Exploring Docker container's file system
I've noticed with docker that I need to understand what's happening inside a container or what files exist in there. One example is downloading images from the docker index - you don't have a clue what the image contains so it's impossible to start the application.
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Jquery insert new row into table at a certain index
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You can use .eq() and .after() like this:
$('#my_table > tbody > tr').eq(i-1).after(html);
The indexes are 0 based, so to be the 4th row, you need i-1, since .eq(3) would be the 4th row, you need to go back to the 3rd row (2) and inse...
How to export DataTable to Excel
...er();
wb.Worksheets.Add(dt,"WorksheetName");
The developer is responsive and helpful. The project is actively developed, and the documentation is superb.
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How to save a data.frame in R?
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There is also dump and files created would be source()-ed, although the help(dump) page says save is "safer".
– IRTFM
Dec 1 '11 at 17:44
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Disable cross domain web security in Firefox
...-ons (some of which don't work in the latest Firefox or don't work at all) and "you just need to enable support on the server".
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How do I remove leading whitespace in Python?
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The lstrip() method will remove leading whitespaces, newline and tab characters on a string beginning:
>>> ' hello world!'.lstrip()
'hello world!'
Edit
As balpha pointed out in the comments, in order to remove only spaces from the beginning of the string, lstrip(' ') s...
Default initialization of std::array?
...zed (C++11 §8.5/11). That includes objects of type std::array<T, N> and T[N].
Be aware that there are types for which default initialization has no effect and leaves the object's value indeterminate: any non-class, non-array type (§8.5/6). Consequently, a default-initialized array of object...
jQuery to retrieve and set selected option value of html select element
I am attempting to retrieve and set the selected value of a select element (drop down list) with jQuery.
9 Answers
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Undoing accidental git stash pop
...ink there are always two commits for a stash, since it preserves the index and the working copy (so often the index commit will be empty). Then git show them to see the diff and use patch -R to unapply them.
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How do negative margins in CSS work and why is (margin-top:-5 != margin-bottom:5)?
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Negative margins are valid in css and understanding their (compliant) behaviour is mainly based on the box model and margin collapsing. While certain scenarios are more complex, a lot of common mistakes can be avoided after studying the spec.
For instance, r...