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How to efficiently concatenate strings in go
...fmt"
)
func main() {
var buffer bytes.Buffer
for i := 0; i < 1000; i++ {
buffer.WriteString("a")
}
fmt.Println(buffer.String())
}
This does it in O(n) time.
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i...
How is a CRC32 checksum calculated?
...ikipedia
CRC calculation
Or in hex and binary:
0x 01 04 C1 1D B7
1 0000 0100 1100 0001 0001 1101 1011 0111
The highest term (x32) is usually not explicitly written, so it can instead be represented in hex just as
0x 04 C1 1D B7
Feel free to count the 1s and 0s, but you'll find they m...
generate days from date range
..., procedures, or temp tables. The subquery generates dates for the last 10,000 days, and could be extended to go as far back or forward as you wish.
select a.Date
from (
select curdate() - INTERVAL (a.a + (10 * b.a) + (100 * c.a) + (1000 * d.a) ) DAY as Date
from (select 0 as a union all s...
High performance fuzzy string comparison in Python, use Levenshtein or difflib [closed]
... normalization (spell check) in which I check each given word against 900,000 word medical dictionary. I am more concern about the time complexity/performance.
...
What is the best way to count “find” results?
...ntf '.' \; | wc -c , but this takes far too long when there are more than 10000 results. Is there no faster/better way to do this?
...
Efficiency of Java “Double Brace Initialization”?
...finitely.
Experiment
Here's the simple experiment I've tested -- make 1000 ArrayLists with the elements "Hello" and "World!" added to them via the add method, using the two methods:
Method 1: Double Brace Initialization
List<String> l = new ArrayList<String>() {{
add("Hello");
...
Accessing dict_keys element by index in Python3
... dicts, since the whole thing doesn't have to be stored in memory.
For 10.000.000 items I found it to be almost 40.000 times faster.
*The first item in case of a dict being just a pseudo-random item before Python 3.6 (after that it's ordered in the standard implementation, although it's not advise...
Convert Array to Object
...the initial object that was created. Running a JSPerf test on an array of 1000 elements, creating a new object every time is 1,000 times slower than mutating the existing object. jsperf.com/…
– romellem
Nov 26 '19 at 17:00
...
Easier way to create circle div than using an image?
...idth: 50px;
height: 50px;
background: #ccc;
border: 3px solid #000;
}
.type3 {
width: 500px;
height: 500px;
background: aqua;
border: 30px solid blue;
}
HTML:
<div class="circleBase type1"></div>
<div class="circleBase type2"></div><div clas...
How do I increase the capacity of the Eclipse output console?
...cters) to something much bigger. 2147383647 / ~2GB is the upper limit (or 1000000 / ~1MB in older releases). Or just uncheck the Limit console output.
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