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What's the difference between ES6 Map and WeakMap?
...s you see, after removing k1 key from the memory we can still access it inside the map. At the same time removing k2 key of WeakMap removes it from wm as well by reference.
That's why WeakMap hasn't enumerable methods like forEach, because there is no such thing as list of WeakMap keys, they are ju...
When should I use a table variable vs temporary table in sql server?
...o object types. This also addresses your question about disk vs memory (I didn't see any significant difference in behaviour between the two).
Regarding the question in the title though as to when to use a table variable vs a local temporary table you don't always have a choice. In functions, for e...
Download File Using Javascript/jQuery
...
Use an invisible <iframe>:
<iframe id="my_iframe" style="display:none;"></iframe>
<script>
function Download(url) {
document.getElementById('my_iframe').src = url;
};
</script>
To force the browser to download a file it would otherwi...
实战低成本服务器搭建千万级数据采集系统 - 更多技术 - 清泛网 - 专注C/C++...
...法。由于有两个表作为数据插入表，使用数据库表的自增id并不太合适，需要一个高速的唯一自增Id服务器提供生成分布式ID。另数据库完全可以关闭写事务日志 ，提高性能，因为抓取的数据当时丢失再启动抓取就可以了， 这样...
iOS - How to set a UISwitch programmatically
...in the developer API, the task setOn: animated: should do the trick.
- (void)setOn:(BOOL)on animated:(BOOL)animated
So to set the switch ON in your program, you would use:
Objective-C
[switchName setOn:YES animated:YES];
Swift
switchName.setOn(true, animated: true)
...
Inefficient jQuery usage warnings in PHPStorm IDE
I recently upgraded my version of PHPStorm IDE and it now warns me about inefficient jQuery usage.
3 Answers
...
How can I make a multipart/form-data POST request using Java?
...uest. It's expecting the following parameters: ~@PathVariable final String id, @RequestParam("image") final MultipartFile image, @RequestParam("l") final String l, @RequestParam("lo") final String lo, @RequestParam("bac") final String bac, @RequestParam("cac") final String ca...
Laravel Eloquent groupBy() AND also return count of each group
...et collection, groupBy and count:
$collection = ModelName::groupBy('group_id')
->selectRaw('count(*) as total, group_id')
->get();
Cheers!
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How to make remote REST call inside Node.js? any CURL?
... http.request
var options = {
host: url,
port: 80,
path: '/resource?id=foo&bar=baz',
method: 'POST'
};
http.request(options, function(res) {
console.log('STATUS: ' + res.statusCode);
console.log('HEADERS: ' + JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data',...
Run an exe from C# code
...
using System.Diagnostics;
class Program
{
static void Main()
{
Process.Start("C:\\");
}
}
If your application needs cmd arguments, use something like this:
using System.Diagnostics;
class Program
{
static void Main()
{
LaunchCommandLineApp(...