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Get index of array element faster than O(n)
Given I have a HUGE array, and a value from it. I want to get index of the value in array. Is there any other way, rather then call Array#index to get it? The problem comes from the need of keeping really huge array and calling Array#index enormous amount of times.
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How to output loop.counter in python jinja template?
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The counter variable inside the loop is called loop.index in jinja2.
>>> from jinja2 import Template
>>> s = "{% for element in elements %}{{loop.index}} {% endfor %}"
>>> Template(s).render(elements=["a", "b", "c", "d"])
1 2 3 4
See http://jinja...
Untrack files from git temporarily
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git update-index should do what you want
This will tell git you want to start ignoring the changes to the file
git update-index --assume-unchanged path/to/file
When you want to start keeping track again
git update-index --no-assume-un...
How can I find the length of a number?
..."Starting weissteinLength length.");
let startTime = Date.now();
for (let index = 0; index < iterations; index++) {
weissteinLength(Math.random() * maxSize);
}
console.log("Ended weissteinLength length. Took : " + (Date.now() - startTime ) + "ms");
// ------- String length slowest.
conso...
how to get the one entry from hashmap without iterating
...no such thing as 'the first entry', and that's also why there is no get-by-index method on Map (or HashMap).
You could do this:
Map<String, String> map = ...; // wherever you get this from
// Get the first entry that the iterator returns
Map.Entry<String, String> entry = map.entrySet...
How can I perform a culture-sensitive “starts-with” operation from the middle of a string?
...o know the length of the substring that was actually matched. But Compare, IndexOf ..etc
throw that information away. It could be possible with regular expressions but the implementation doesn't do full case folding and so doesn't match
ß to ss/SS in case-insensitive mode even though .Compare and ....
curl_exec() always returns false
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+1: Simple and straight trouble-shooting for curl in PHP on curl_exec FALSE return. - Curl Verbose Mode in PHP example
– hakre
Nov 9 '12 at 20:10
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How to Get True Size of MySQL Database?
... MySQL forum:
SELECT table_schema "database name",
sum( data_length + index_length ) / 1024 / 1024 "database size in MB",
sum( data_free )/ 1024 / 1024 "free space in MB"
FROM information_schema.TABLES
GROUP BY table_schema;
Or in a single line for easier copy-pasting:
SELECT table_sche...
MongoDB/NoSQL: Keeping Document Change History
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Will this affect performance if indexed fields represented as arrays?
– DmitriD
Jun 14 '17 at 2:28
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How to add pandas data to an existing csv file?
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Correct answer, of course, just a note: passing index=False will tell df.to_csv not to write the row index to the first column. Depending on the application, this might make sense to avoid a meaningless index column.
– user35915
Aug 4...