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地图组件（高德地图） · App Inventor 2 中文网
...特征多少，是否透明。1 ~ 7 可以自行试试效果。
如有问题，点此参与讨论。
中心坐标字串
设置地图的初始中心坐标（纬度,经度），以英文逗号分隔的十进制经纬度坐标形式指定，例如：39.903179, 116.397427（天安门）。
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How to get an array of unique values from an array containing duplicates in JavaScript? [duplicate]
...
If you want to maintain order:
arr = arr.reverse().filter(function (e, i, arr) {
return arr.indexOf(e, i+1) === -1;
}).reverse();
Since there's no built-in reverse indexof, I reverse the array, filter out duplicates, then re-reverse it.
The ...
How do I prevent node.js from crashing? try-catch doesn't work
From my experience, a php server would throw an exception to the log or to the server end, but node.js just simply crashes. Surrounding my code with a try-catch doesn't work either since everything is done asynchronously. I would like to know what does everyone else do in their production servers.
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Macro vs Function in C
...ator though... overlooked that... But it might still be less readable.)
Order of Operations: (courtesy of @ouah)
#define min(a,b) (a < b ? a : b)
min(x & 0xFF, 42)
gets expanded to:
(x & 0xFF < 42 ? x & 0xFF : 42)
But & has lower precedence than <. So 0xFF < 42 ...
How do I sort strings alphabetically while accounting for value when a string is numeric?
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Pass a custom comparer into OrderBy. Enumerable.OrderBy will let you specify any comparer you like.
This is one way to do that:
void Main()
{
string[] things = new string[] { "paul", "bob", "lauren", "007", "90", "101"};
foreach (var thing in...
Concurrent HashSet in .NET Framework?
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@Ralf Well, it's a set, not a list, as it's unordered.
– Servy
Sep 20 '13 at 18:18
11
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Foreign key constraints: When to use ON UPDATE and ON DELETE
... "I wouldn't want a customer delete to wipe out the financial data for the orders he had previously." In a situation like that, you probably still need the customer's data anyway. Your design should probably be marking the customer as inactive, not deleting their row from the database. In practice...
Property getters and setters
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In order to override setter and getter for swift variables use the below given code
var temX : Int?
var x: Int?{
set(newX){
temX = newX
}
get{
return temX
}
}
We need to keep the value of va...
How to set the prototype of a JavaScript object that has already been instantiated?
...mutability means implementations must check for cyclic prototype chains in order to avoid ilooping. [constant checks for infinite recursion are required]
Finally, mutating __proto__ on an existing object may break non-generic methods in the new prototype object, which cannot possibly work on th...
How does zip(*[iter(s)]*n) work in Python?
...erences to the same iterator and zip() makes 3-tuples of the integers—in order—from each reference to the iterator:
1,2,3,4,5,6,7,8,9 1,2,3,4,5,6,7,8,9 1,2,3,4,5,6,7,8,9
^ ^ ^
^ ^ ^
^ ...