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A 'for' loop to iterate over an enum in Java
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.values()
You can call the values() method on your enum.
for (Direction dir : Direction.values()) {
// do what you want
}
This values() method is implicitly declared by the compiler. So it is not listed on Enum doc.
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Default argument values in JavaScript functions [duplicate]
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In javascript you can call a function (even if it has parameters) without parameters.
So you can add default values like this:
function func(a, b){
if (typeof(a)==='undefined') a = 10;
if (typeof(b)==='undefined') b = 20;
//your code
}...
Kotlin secondary constructor
...his(name) {
parent.children.add(this)
}
}
it is mandatory to call the primary constructor otherwise, the compiler will throw the following error
Primary constructor call expected
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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 - App Invent...
...示values数据是否是有符号的数值（假表示无符号）serviceUuid - 服务UUID，通俗来讲它就是硬件的唯一身份IDcharacteristicUuid - 特性UUID，通俗来讲它是硬件中某一功能的唯一身份ID
一个硬件UUID示例如下：UUID分为标准UUID和厂商自定义...
Function to convert column number to letter?
...nge = Worksheet.Cells[1,column], were throwing errors (either in the Cells call or when I tried to take the address, can't remember - sorry - which lines where throwing in which specific cases.)
– Sam Azer
Aug 7 '19 at 16:01
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How Do I Take a Screen Shot of a UIView?
...thod you would override...
Note that it may not work in all views, specifically a year or so ago when I tried to use this with the live camera view it did not work.
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How to create the perfect OOP application [closed]
...TaxMethodPractice should not contain a list of TaxMethod. Instead, a class called SalesPolicy should contain this list. A class called SalesEngine should be passed a SalesPolicy, an Order and a TaxCalculator. SalesEngine will apply the SalesPolicy on the items in the Order and calculate the Tax usin...
CABasicAnimation resets to initial value after animation completes
...gate to "self", your instance will be retained by the animation. So, after calling removeFromSuperview if you forget to remove/destroy the animation by yourself, dealloc for instance will not be called. You'll have a memory leak.
– emrahgunduz
Jan 22 '15 at 14:...
Changing user agent on urllib2.urlopen
...headers should be a dictionary, and will be treated as if add_header() was called with each key and value as arguments. This is often used to “spoof” the User-Agent header, which is used by a browser to identify itself – some HTTP servers only allow requests coming from common browsers as oppo...
How to pass parameters to anonymous class?
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Technically, no, because anonymous classes can't have constructors.
However, classes can reference variables from containing scopes. For an anonymous class these can be instance variables from the containing class(es) or local va...