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How do I analyze a .hprof file?
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Some of what you can do is mind-blowingly good for finding memory leaks etc -- including running a form of limited SQL (OQL) against the in-memory objects, i.e.
SELECT toString(firstName) FROM com.yourcompany.somepackage.User
Totally brilliant.
...
Can Android do peer-to-peer ad-hoc networking?
...u can connect your android device to a known ad-hoc network.
edit /system/etc/wifi/tiwlan.ini
WiFiAdhoc = 1
dot11DesiredSSID = <your_network_ssid>
dot11DesiredBSSType = 0
edit /data/misc/wifi/wpa_supplicant.conf
ctrl_interface=tiwlan0
update_config=1
eapol_version=1
ap_scan=2
if that ...
python pandas dataframe to dictionary
....T.to_dict('records')
If you have multiple values, like val1, val2, val3,etc and u want them as lists, then use the below code:
df.set_index('id').T.to_dict('list')
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Rails Migration: Remove constraint
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In Rails 4+ in order to remove not-null constraint, you can use change_column_null:
change_column_null :users, :address, true
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im...
How to compare two floating point numbers in Bash?
... then
echo "${FOO} > ${BAR}";
else
echo "${FOO} <= ${BAR}";
fi
Order of logical operators matters. Integer parts are compared as numbers and fractional parts are intentionally compared as strings. Variables are split into integer and fractional parts using this method.
Won't compare flo...
How to copy file from HDFS to the local file system
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In order to copy files from HDFS to the local file system the following command could be run:
hadoop dfs -copyToLocal <input> <output>
<input>: the HDFS directory path (e.g /mydata) that you want to copy
<...
Naming “class” and “id” HTML attributes - dashes vs. underlines [closed]
...selectors by any characters (including none at all) other than hyphens, in order to improve understanding and scannability.
/* Not recommended: does not separate the words “demo” and “image” */
.demoimage {}
/* Not recommended: uses underscore instead of hyphen */
.error_status {}
/* Reco...
Why does ConcurrentHashMap prevent null keys and values?
...re is other sorts of locking done. That's what makes it "Concurrent". In order to do that, it needs an Object to hang on.
– Paul Tomblin
Mar 30 '09 at 19:26
2
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SQLite DateTime comparison
...ngs - you can see it at the quotes - But this is the great idea: With this order YY MM DD it's possible to compare the dates. @Damon it also should work with the dashes!
– Sedat Kilinc
Nov 24 '11 at 17:15
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How to count duplicate value in an array in javascript
...' times');
}
}
count();
Demo Fiddle
You can use higher-order functions too to do the operation. See this answer
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