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How do I convert an NSString value to NSData?
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NSString* str = @"teststring";
NSData* data = [str dataUsingEncoding:NSUTF8StringEncoding];
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Improve INSERT-per-second performance of SQLite
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Avoid sqlite3_clear_bindings(stmt).
The code in the test sets the bindings every time through which should be enough.
The C API intro from the SQLite docs says:
Prior to calling sqlite3_step() for the first time or immediately
after sqlite3_reset(), the application can ...
Get the index of the object inside an array, matching a condition
...big arrays a simple loop will perform much better than findIndex:
let test = [];
for (let i = 0; i < 1e6; i++)
test.push({prop: i});
let search = test.length - 1;
let count = 100;
console.time('findIndex/predefined function');
let fn = obj => obj.prop === search;
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How to Generate unique file names in C#
...too, and doesn't suffer from race conditions.
For example, if you pass it test.txt, it will attempt to create files in this order:
test.txt
test (2).txt
test (3).txt
etc. You can specify the maximum attempts or just leave it at the default.
Here's a complete example:
class Program
{
stati...
Connect to a locally built Jekyll Server using mobile devices in the LAN
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First part worked as indicated (jekyll 2.5.3), did not test second part (about entry in config file).
– j4v1
Mar 26 '15 at 20:15
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How to convert list of tuples to multiple lists?
...87597s
Running it multiple times, append is 3x - 4x faster than zip! The test script is here:
#!/usr/bin/env python3
import time
N = 2000000
xs = list(range(1, N))
ys = list(range(N+1, N*2))
zs = list(zip(xs, ys))
t1 = time.time()
xs_, ys_ = zip(*zs)
print(len(xs_), len(ys_))
t2 = time.time()...
How to write log to file
...ed differently in the past, but this works for me:
f, err := os.OpenFile("testlogfile", os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
if err != nil {
log.Fatalf("error opening file: %v", err)
}
defer f.Close()
log.SetOutput(f)
log.Println("This is a test log entry")
Based on the Go docs, os.O...
How to delete migration files in Rails 3
...ust revert it on all environments it already ran (production, development, testing, staging, etc) before deleting its file. That's also why I wrote that it's safer to just create another migration to revert that old one, once it's already ran on production.
– Fábio Batista
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Get specific object by id from array of objects in AngularJS
...ns the value of the first element in the array that satisfies the provided testing function.
– abosancic
Jul 20 '17 at 13:12
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Constantly print Subprocess output while process is running
...stderr=subprocess.STDOUT this captures stderr, and I believe (but I've not tested) that it also captures stdin.
– Andrew Martin
May 13 '14 at 18:11
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