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Best way to iterate through a Perl array
...sage: They're all the same except for #5.
for (@a) is special-cased to avoid flattening the array. The loop iterates over the indexes of the array.
In terms of readability: #1.
In terms of flexibility: #1/#4 and #5.
#2 does not support elements that are false. #2 and #3 are destructive.
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Override ActiveRecord attribute methods
...er, you can also use a "hash notation" to access attributes that have overridden accessors and mutators:
def name=(name)
self[:name] = name.capitalize
end
def name
self[:name].downcase
end
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Remove files from Git commit
... the commit that you want the file to conform to.
git checkout <commit_id> <path_to_file>
you can do this multiple times if you want to remove many files.
2.
git commit -am "remove unwanted files"
3.
Find the commit_id of the commit on which the files were added mistakenly, let's...
What does tree-ish mean in Git?
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The Short Answer (TL;DR)
"Tree-ish" is a term that refers to any identifier (as specified in the Git
revisions documentation) that ultimately leads to a (sub)directory
tree (Git refers to directories as "trees" and "tree objects").
In the original poster's case, foo is a directory that he...
Get image data url in JavaScript?
... the original file, but a re-encoded version. If you need the result to be identical to the original, see Kaiido's answer.
You will need to create a canvas element with the correct dimensions and copy the image data with the drawImage function. Then you can use the toDataURL function to get a dat...
Iterating a JavaScript object's properties using jQuery
...key2:'value2',key3:'value3',key4:'value4'},
ulkeys=document.getElementById('object-keys'),str='';
var keys = Object.keys(a);
for(i=0,l=keys.length;i<l;i++){
str+= '<li>'+keys[i]+' : '+a[keys[i]]+'</li>';
}
ulkeys.innerHTML=str;
<ul id="object-keys"></ul>
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How to create a drop shadow only on one side of an element?
...udo element is required.
#box {
background-color: #3D6AA2;
width: 160px;
height: 90px;
position: absolute;
top: calc(10% - 10px);
left: calc(50% - 80px);
}
.box-shadow:after {
content:"";
position:absolute;
width:100%;
bottom:1px;
z-ind...
How to get sp_executesql result into a variable?
...ELECT @tablename = N'products'
SELECT @sSQL = N'SELECT @retvalOUT = MAX(ID) FROM ' + @tablename;
SET @ParmDefinition = N'@retvalOUT int OUTPUT';
EXEC sp_executesql @sSQL, @ParmDefinition, @retvalOUT=@retval OUTPUT;
SELECT @retval;
But if you don't, and can not modify the SP:
-- Assuming th...
Eclipse, regular expression search and replace
... the whole original search term. In this case I guess that would work coincidentally though.
– Walter Heck
Nov 28 '11 at 11:32
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Copying data from one SQLite database to another
... databases with common data but with different purposes and I wanted to avoid reinserting data, so I was wondering if it was possible to copy a whole table from one database to another?
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