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What's the difference between HEAD^ and HEAD~ in Git?
...n I specify an ancestor commit object in Git, I'm confused between HEAD^ and HEAD~ .
15 Answers
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How can I format my grep output to show line numbers at the end of the line, and also the hit count?
...two null, - Line number : 2
example four null, - Line number : 4
Use command substitution to print out the total null count:
$ echo "Total null count :" $(grep -ic null myfile.txt)
Total null count : 2
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How to write a UTF-8 file with Java?
I have some current code and the problem is its creating a 1252 codepage file, i want to force it to create a UTF-8 file
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find() with nil when there are no records
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Yes, just do:
Challenge.find_by_id(10)
For Rails 4 and 5:
Challenge.find_by(id: 10)
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The preferred way of creating a new element with jQuery
...ss": "a"});
$div.click(function(){ /* ... */ });
$("#box").append($div);
And of course .html('*') overrides the content while .append('*') doesn't, but I guess, this wasn't your question.
Another good practice is prefixing your jQuery variables with $:
Is there any specific reason behind using $ ...
How can I convert comma separated string into a List
... yes as the Select extension in this case returns IEnumerable<Int32> and it is not list. However list has a constructor accepting another collection as source.
– Oybek
Feb 15 '12 at 21:07
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Change values while iterating
... prints you completely different memory locations for the value from range and the actual
value in the slice:
0xf84000f010 vs. 0x7f095ed0bf68
0xf84000f014 vs. 0x7f095ed0bf68
0xf84000f018 vs. 0x7f095ed0bf68
So the only thing you can do is to either use pointers or the index, as already proposed ...
Setting variable to NULL after free
...dangling pointer is accessed after it is freed, you may read or overwrite random memory. If a null pointer is accessed, you get an immediate crash on most systems, telling you right away what the error is.
For local variables, it may be a little bit pointless if it is "obvious" that the pointer isn...
Backbone.View “el” confusion
How should a view's el be handled?
It has to be set, otherwise events don't fire (see here ).
3 Answers
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Measure and Benchmark Time for Ruby Methods
How can i measure the time taken by a method and the individual statements in that method in Ruby. If you see the below method i want to measure the total time taken by the method and the time taken for database access and redis access. I do not want to write Benchmark.measure before every statement...