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How to test valid UUID/GUID?
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Perfect, thanks for this!
– José Veríssimo
Sep 14 at 15:03
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What underlies this JavaScript idiom: var self = this?
I saw the following in the source for WebKit HTML 5 SQL Storage Notes Demo :
10 Answers
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How do I store an array in localStorage? [duplicate]
... Feb 26 '16 at 11:13
Thomas Mairé
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answered Jul 28 '10 at 21:23
Dagg Nab...
How to remove a directory from git repository?
...it tracked, but the repository structure remains.
– Néstor
Aug 29 '18 at 16:57
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Grepping a huge file (80GB) any way to speed it up?
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If you have a multicore CPU, I would really recommend GNU parallel. To grep a big file in parallel use:
< eightygigsfile.sql parallel --pipe grep -i -C 5 'db_pd.Clients'
Depending on your disks and CPUs it may be faster to read larger blocks:
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com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
... edited Feb 26 '15 at 16:46
Félix Gagnon-Grenier
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answered Feb 26 '15 at 9:22
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What are bitwise operators?
...ut bit on the bottom line. So the answer to the above expression is 4. The CPU has done (in this example) 8 separate "AND" operations in parallel, one for each column.
I mention this because I still remember having this "AHA!" moment when I learned about this many years ago.
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Fast way of finding lines in one file that are not in another?
...iently large that storing them both causes a memory problem, you can trade CPU for memory by storing only file1 and deleting matches along the way as file2 is read.
BEGIN { FS="" }
(NR==FNR) { # file1, index by lineno and string
ll1[FNR]=$0; ss1[$0]=FNR; nl1=FNR;
}
(NR!=FNR) { # file2
if ($0 ...
Iterating each character in a string using Python
...chived with: for c in reversed("string")
– Akseli Palén
Jul 12 '12 at 23:05
From which part of the documentation do y...
Placing/Overlapping(z-index) a view above another view in android
...do this? Thanks in advance! :D
– Merlí Escarpenter Pérez
Feb 17 '15 at 10:53
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As of API 21 / K...