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How to select a single field for all documents in a MongoDB collection?
In my MongoDB, I have a student collection with 10 records having fields name and roll . One record of this collection is:
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通信连接组件 · App Inventor 2 中文网
...的「版本号」。
本机版本名
当前应用的版本名，如 1.0，对应屏幕属性里的「版本名」。
正在下载
是否正在下载安装包。
通知栏显示进度
下载时在通知栏显示进度条，默认为真。
使用内置对话框
默认为真：发现...
How do you use String.substringWithRange? (or, how do Ranges work in Swift?)
...NSString = str as NSString
myNSString.substringWithRange(NSRange(location: 0, length: 3))
Note: as JanX2 mentioned, this second method is not safe with unicode strings.
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Java: how to convert HashMap to array
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answered Jul 7 '09 at 5:47
Landon KuhnLandon Kuhn
59.1k4141 gold badges9999 silver badges129129 bronze badges
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Extract a number from a string (JavaScript)
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606
For this specific example,
var thenum = thestring.replace( /^\D+/g, ''); // replace all leadi...
Print all day-dates between two dates [duplicate]
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I came up with this:
from datetime import date, timedelta
sdate = date(2008, 8, 15) # start date
edate = date(2008, 9, 15) # end date
delta = edate - sdate # as timedelta
for i in range(delta.days + 1):
day = sdate + timedelta(days=i)
print(day)
The output:
2008-08-15
2008-...
Checkboxes in web pages – how to make them bigger?
...r.
input[type='checkbox'] {
-webkit-appearance:none;
width:30px;
height:30px;
background:white;
border-radius:5px;
border:2px solid #555;
}
input[type='checkbox']:checked {
background: #abd;
}
<input type="checkbox" />
...
Generate random password string with requirements in javascript
...work?
Math.random() // Generate random number, eg: 0.123456
.toString(36) // Convert to base-36 : "0.4fzyo82mvyr"
.slice(-8);// Cut off last 8 characters : "yo82mvyr"
Documentation for the Number.prototype.toString and strin...
CSS image resize percentage of itself?
...f. For example, I just want to shrink the image by half by resizing it to 50%. But applying width: 50%; will resize the image to be 50% of the container element (the parent element which maybe the <body> for example).
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How do I print out the contents of an object in Rails for easy debugging?
...ssor :name, :age
end
user = User.new
user.name = "John Smith"
user.age = 30
puts user.inspect
#=> #<User:0x423270c @name="John Smith", @age=30>
puts user.to_yaml
#=> --- !ruby/object:User
#=> age: 30
#=> name: John Smith
Hope that helps.
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