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How can I convert tabs to spaces in every file of a directory?
...iles.
Downsides:
Will replace tabs everywhere in a file.
Will take a long time if you happen to have a 5GB SQL dump in this directory.
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Is it better to reuse a StringBuilder in a loop?
... public static void main( String[] args ) throws Exception {
long time = System.currentTimeMillis();
for( int i = 0; i < 10000000; i++ ) {
StringBuilder sb = new StringBuilder();
sb.append( "someString" );
sb.append( "someString2"+i );
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Renaming files in a folder to sequential numbers
...s Great. Beauty in one line. I added ls -tr get the files by last modified time.
– Ranjith Siji
May 24 '16 at 7:20
37
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Why does Java's Arrays.sort method use two different sorting algorithms for different types?
...of primitives and merge sort for arrays of objects. I believe that most of time Quicksort is faster than merge sort and costs less memory. My experiments support that, although both algorithms are O(n log(n)). So why are different algorithms used for different types?
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Python function overloading
... When working with languages that can discriminate data types at
compile-time, selecting among the alternatives can occur at
compile-time. The act of creating such alternative functions for
compile-time selection is usually referred to as overloading a
function. (Wikipedia)
Python is a dyn...
How to set my default shell on Mac?
I do not like to retype fish every time I start terminal. I want fish on by default. How can I set fish shell as my default shell on a Mac?
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List of Delphi language features and version in which they were introduced/deprecated
...rt for regular expressions.
Delphi 2010
Enhanced Delphi RTTI (Run Time Type Information).
Attributes
The as operator can be used to cast an interface reference back to the object from which it was extracted.
The is operator can be used to verify whether an interface reference was ex...
How can I see normal print output created during pytest run?
Sometimes I want to just insert some print statements in my code, and see what gets printed out when I exercise it. My usual way to "exercise" it is with existing pytest tests. But when I run these, I don't seem able to see any standard output (at least from within PyCharm, my IDE).
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Find integer index of rows with NaN in pandas dataframe
...
in the case you have datetime index and you want to have the values:
df.loc[pd.isnull(df).any(1), :].index.values
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Null coalescing in powershell
...the Core family to eventually replace the legacy Framework family. By the time you read this, a compatible version of PowerShell may come pre-installed on your system; if not, see https://github.com/powershell/powershell.
Per the documentation, the following operators are supported out-of-the-box ...