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How to instantiate a File object in JavaScript?
...me");
The first argument is the data provided as an array of lines of text;
The second argument is the filename ;
The third argument looks like:
var f = new File([""], "filename.txt", {type: "text/plain", lastModified: date})
It works in FireFox, Chrome and Opera, but not in Safari or IE/Edge...
How do I focus on one spec in jasmine.js?
...ling specs from a rather large architectural change. I'd like to work on fixing them one by one by tagging each one with 'focus'.
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How to copy a collection from one database to another in MongoDB
...on for toying around with the shell. Plus, it would not bring over the indexes. If I was doing this, I would do the mongodump/mongorestore every time.
– Jason McCay
Jul 19 '12 at 6:18
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推荐系统算法初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...阵，如下：
图中，行是不同的用户，列是所有物品，(x, y)的值则是x用户对y物品的评分（喜好程度）。我们可以把每一行视为一个用户对物品偏好的向量，然后计算每两个用户之间的向量距离，这里我们用余弦相似度来算：
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Programmatically get the cache line size?
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On Linux (with a reasonably recent kernel), you can get this information out of /sys:
/sys/devices/system/cpu/cpu0/cache/
This directory has a subdirectory for each level of cache. Each of those directories contains the followin...
Get all directories within directory nodejs
...10.0+
We can use the new withFileTypes option of readdirSync to skip the extra lstatSync call:
const { readdirSync } = require('fs')
const getDirectories = source =>
readdirSync(source, { withFileTypes: true })
.filter(dirent => dirent.isDirectory())
.map(dirent => dirent.name)...
Very simple log4j2 XML configuration file using Console and File appender
I'd like a very simple XML configuration file with a console and a file appender using log4j2.
4 Answers
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How to send HTTP request in java? [duplicate]
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You can use java.net.HttpUrlConnection.
Example (from here), with improvements. Included in case of link rot:
public static String executePost(String targetURL, String urlParameters) {
HttpURLConnection connection = null;
try {
//Create connection
URL ...
Codesign error: Provisioning profile cannot be found after deleting expired profile
... an app that was working just yesterday. Got a message that a profile had expired, so I removed it from the iPod and from iTunes. When I chose a new profile (one with an * in the identifier), I now get an error:
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How to check if a column exists in a SQL Server table?
I need to add a specific column if it does not exist. I have something like the following, but it always returns false:
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