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How to wait for all goroutines to finish without using time.Sleep?
...",
"http://www.somestupidname.com/",
}
for _, url := range urls {
// Increment the WaitGroup counter.
wg.Add(1)
// Launch a goroutine to fetch the URL.
go func(url string) {
// Dec...
Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
...ticDimension
}
// number of rows in table view
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.animals.count
}
// create a cell for each table view row
func tableView(_ tableView: UITableView, cellForRowAt indexPa...
Why should hash functions use a prime number modulus?
...e comes out to be a factor of the bucket count then you can only do (bucket_count / stride) probes before you're back where you started. The case you most want to avoid is stride = 0, of course, which must be special-cased, but to avoid also special-casing bucket_count / stride equal to a small inte...
The difference between fork(), vfork(), exec() and clone()
...all program (think Java's Runtime.exec()). POSIX has standardized the posix_spawn() to replace these latter two more modern uses of vfork().
posix_spawn() does the equivalent of a fork()/execve(), and also allows some fd juggling in between. It's supposed to replace fork()/execve(), mainly for non-M...
Generating an MD5 checksum of a file
...y and feed them to the md5 method:
import hashlib
def md5(fname):
hash_md5 = hashlib.md5()
with open(fname, "rb") as f:
for chunk in iter(lambda: f.read(4096), b""):
hash_md5.update(chunk)
return hash_md5.hexdigest()
Note: hash_md5.hexdigest() will return the hex s...
Loading cross-domain endpoint with AJAX
...options.url;
}
});
$.get(
'http://en.wikipedia.org/wiki/Cross-origin_resource_sharing',
function (response) {
console.log("> ", response);
$("#viewer").html(response);
});
Whatever Origin
Whatever Origin is a cross domain jsonp access. This is an open source altern...
Apache Spark: map vs mapPartitions?
...lize(List("dog", "salmon", "salmon", "rat", "elephant"), 3)
val b = a.map(_.length)
val c = a.zip(b)
c.collect
res0: Array[(String, Int)] = Array((dog,3), (salmon,6), (salmon,6), (rat,3), (elephant,8))
mapPartitions
This is a specialized map that is called only once for each partition.
...
Proper SCSS Asset Structure in Rails
...it. So they can be used in type.scss in the bootstrap folder but also in my_model.css.scss.
After this create a folder named partials or modules. This will be the place of most of the other files. You can just add the import to the application.scss file so it will look like:
@import "bootstrap/bo...
How to access the correct `this` inside a callback?
...ontrived example:
var arr = [1, 2, 3];
var obj = {multiplier: 42};
var new_arr = arr.map(function(v) {
return v * this.multiplier;
}, obj); // <- here we are passing `obj` as second argument
Note: Whether or not you can pass a value for this is usually mentioned in the documentation of that...
What are the downsides to using Dependency Injection? [closed]
...n ivory tower builder.
Relevant Links
http://thedailywtf.com/Articles/The_Inner-Platform_Effect.aspx
http://www.joelonsoftware.com/articles/fog0000000018.html
Probably the simplest form of dependency injection (don't laugh) is a parameter. The dependent code is dependent on data, and that data...