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Accessing private member variables from prototype-defined functions
...efined on a prototype are not defined within the scope of the constructor, and will not have access to the constructor's local variables.
You can still have private variables, but if you want methods defined on the prototype to have access to them, you should define getters and setters on the this ...
How to avoid null checking in Java?
...y either don't know or don't trust the contracts they are participating in and defensively overcheck for nulls. Additionally, when writing their own code, they tend to rely on returning nulls to indicate something thus requiring the caller to check for nulls.
To put this another way, there are two...
Differences between Perl and PHP [closed]
I'm planning to learn Perl 5 and as I have only used PHP until now, I wanted to know a bit about how the languages differ from each other.
...
App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
...有限的物联网设备进行通信的首选。BluetoothLE 扩展需要 Android 5.0 或更高版本。
2种通信方式：扫描和广播
扫描
详细接入步骤：
开始扫描 -> 获取BLE设备列表 -> 连接指定设备（也可指定MAC地址连接）-> 设备指定服务uuid和特征...
What does the question mark in Java generics' type parameter mean?
...eloping in Java for about 4 years, but have never had a very strong understanding of what this style of code is supposed to indicate.
...
What is the difference between atomic / volatile / synchronized?
...return counter++;
}
It basically reads value from memory, increments it and puts back to memory. This works in single thread but nowadays, in the era of multi-core, multi-CPU, multi-level caches it won't work correctly. First of all it introduces race condition (several threads can read the value...
Move the most recent commit(s) to a new branch with Git
... to move the last several commits I've committed to master to a new branch and take master back to before those commits were made. Unfortunately, my Git-fu is not strong enough yet, any help?
...
Differences between hard real-time, soft real-time, and firm real-time?
I have read the definitions for the different notions of real-time , and the examples provided for hard and soft real-time systems make sense to me. But, there is no real explanation or example of a firm real-time system. According to the link above:
...
how to get last insert id after insert query in codeigniter active record
...d of the last insert performed by the db object you're using. This should handle concurrent inserts, shouldn't it? Please correct me if I'm wrong.
– Abraham Philip
Jul 20 '15 at 20:20
...
jQuery: Return data after ajax call success [duplicate]
... it's waiting for the response.
You can pass in a callback function that handles the result:
function testAjax(handleData) {
$.ajax({
url:"getvalue.php",
success:function(data) {
handleData(data);
}
});
}
Call it like this:
testAjax(function(output){
// here you use t...