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How can I generate an ObjectId with mongoose?
...ngoose = require('mongoose');
var newId = new mongoose.mongo.ObjectId('56cb91bdc3464f14678934ca');
// or leave the id string blank to generate an id with a new hex identifier
var newId2 = new mongoose.mongo.ObjectId();
shar...
Copying PostgreSQL database to another server
...d 9.3 running on localhost:5434) you can run:
pg_dumpall -p 5432 -U myuser91 | psql -U myuser94 -d postgres -p 5434
Check out the migration docs.
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Grouping functions (tapply, by, aggregate) and the *apply family
...b = 1:3, c = 10:100)
lapply(x, FUN = length)
$a
[1] 1
$b
[1] 3
$c
[1] 91
lapply(x, FUN = sum)
$a
[1] 1
$b
[1] 6
$c
[1] 5005
sapply - When you want to apply a function to each element of a
list in turn, but you want a vector back, rather than a list.
If you find yourself typing unlist(lapp...
Metadata file '.dll' could not be found
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App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
... 开通VIP 搜索 App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议
原作者开发动机
用法
传输数据报
...
微博为什么限制140字(附短信70字限制考) - 程序人生、谈天论地 - 清泛IT论...
...一部分），国内也有很不错的翻译版本，可以自行在Google搜索“twitter的创始人可能都还在玩泥巴”。而我最信任的wikipedia大神在SMS的词条中提到，“it was necessary to limit the length of the messages to 128 bytes (later improved to 140 bytes, or 160 7...
App Inventor 2 Encrypt.Security 安全性扩展：MD5哈希，SHA1和SHA256哈希...
... 开通VIP 搜索
App Inventor 2 Encrypt.Security 安全性扩展：MD5哈希，SHA1和SHA256哈希，AES加密/解密，RSA加密/解密，BASE64编码/解码
...
How to detect if multiple keys are pressed at once using JavaScript?
...ving a problem with Paste on a Mac (Chrome). It successfully gets keydown 91 (command), keydown 86 (v), but then only keyups the 91, leaving 86 down. List of keys: Up: 91, Down: 86. This only seems to happen when letting go of the command key second - if I let go of it first it correctly register ...
微博为什么限制140字(附短信70字限制考) - 创意 - 清泛网 - 专注C/C++及内核技术
...一部分），国内也有很不错的翻译版本，可以自行在Google搜索“twitter的创始人可能都还在玩泥巴”。
而我最信任的wikipedia大神在SMS的词条中提到，“it was necessary to limit the length of the messages to 128 bytes (later improved to 140 bytes, or 160...
Fragment Inside Fragment
... android:layout_margin="20dp"
android:background="#91d0c2">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Parent fragment"/>
<FrameLayout
android:id="@+id/child_fragment_c...