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Understanding the map function
...oop
ys = []
for x in xs:
ys.append(x * 2)
n-ary map is equivalent to zipping input iterables together and then applying the transformation function on every element of that intermediate zipped list. It's not a Cartesian product:
xs = [1, 2, 3]
ys = [2, 4, 6]
def f(x, y):
return (x * 2, y...
App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...》。
【实用小技巧】从.aia项目文件中提取.aix拓展包
【自己写拓展】为AppInventor2开发拓展(Extension)
中文网拓展
【数据图表】 ECharts/ECharts3D 拓展：基于 ECharts 强大的个性化数据图表展示
【...
What MySQL data type should be used for Latitude/Longitude with 8 decimal places?
...NT column (2D datatype) with a SPATIAL index.
CREATE TABLE `cities` (
`zip` varchar(8) NOT NULL,
`country` varchar (2) GENERATED ALWAYS AS (SUBSTRING(`zip`, 1, 2)) STORED,
`city` varchar(30) NOT NULL,
`centre` point NOT NULL,
PRIMARY KEY (`zip`),
KEY `country` (`country`),
KEY `city`...
How is mime type of an uploaded file determined by browser?
I have a web app where the user needs to upload a .zip file. On the server-side, I am checking the mime type of the uploaded file, to make sure it is application/x-zip-compressed or application/zip .
...
How to get names of classes inside a jar file?
.../file.jar.
List<String> classNames = new ArrayList<String>();
ZipInputStream zip = new ZipInputStream(new FileInputStream("/path/to/jar/file.jar"));
for (ZipEntry entry = zip.getNextEntry(); entry != null; entry = zip.getNextEntry()) {
if (!entry.isDirectory() && entry.getNa...
How to get progress from XMLHttpRequest
...r.mozilla.org/en/Using_XMLHttpRequest .
Example:
My server script reads a zip file (it takes 5 seconds):
$filesize=filesize('test.zip');
header("Content-Length: " . $filesize); // set header length
// if the headers is not set then the evt.loaded will be 0
readfile('test.zip');
exit 0;
Now I ca...
Phonegap Cordova installation Windows
...waste hours on this.
Go to github and simply download the PhoneGap master .zip
In that zip are project files for window phone, etc platform... just use those templates.
I don't know how such an easy process could have worse documentation. It as if it was written by lawyers.
...
Disable firefox same origin policy
....
If you downloaded the xpi you can jump to step 3. If you downloaded the zip from GitHub, go to step 2.
2) Building the xpi
You need to extract the zip, get inside the "cors-everywhere-firefox-addon-master" folder, select all the items and zip them.
Then, rename the created zip as *.xpi
Note: I...
Download single files from GitHub
...can use to upload files. If you need more than one binary, you can use a .zip file.
The URL to download an uploaded file is:
https://github.com/downloads/user/repository/filename
Note that the URLs given above, from the links on github.com, will redirect to raw.githubusercontent.com. You should ...
中文网（自研/维护）拓展 · App Inventor 2 中文网
...
中文网（自研/维护）拓展 拓展.aix下载
AI2Utils
属性
事件
方法
AirPlaneState
属性
事件
方法
AliSms
...