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LEGO EV3 机器人按键控制 · App Inventor 2 中文网
...eight: 24px; margin-bottom: 4px; background: url(/static/images/feedback.svg) 50% / 100% auto no-repeat; } 文档反馈 切换 目录 在线 客服 扫码添加客服咨询 我要 分享 ...
Get the index of the object inside an array, matching a condition
...big arrays a simple loop will perform much better than findIndex:
let test = [];
for (let i = 0; i < 1e6; i++)
test.push({prop: i});
let search = test.length - 1;
let count = 100;
console.time('findIndex/predefined function');
let fn = obj => obj.prop === search;
...
Truncating all tables in a Postgres database
...= 'public'
LOOP
RAISE NOTICE '%',
-- EXECUTE -- dangerous, test before you execute!
format('TRUNCATE TABLE %I.%I CASCADE', _sch, _tbl);
END LOOP;
END
$func$ LANGUAGE plpgsql;
format() requires Postgres 9.1 or later. In older versions concatenate the query string like th...
Microsoft Web API: How do you do a Server.MapPath?
... Sure, but in your controller or other logic layer that you want to test, you would take only a dependency on your own abstraction, like IPathMapper (you'll probably roll this up with a bunch of other concerns into a bigger toolbelt / utility interface) with the method string MapPath(string v...
Count the number of commits on a Git branch
...on the branch-name as well.
Examples
git checkout master
git checkout -b test
<We do 3 commits>
git rev-list --count HEAD ^master
Result: 3
If your branch comes of a branch called develop:
git checkout develop
git checkout -b test
<We do 3 commits>
git rev-list --count HEAD ^develo...
Configure WAMP server to send email
...y be able to help, or they may perhaps agree with me.
If you just want to test, here is a great tool for testing mail locally, that requires almost no configuration:
http://www.toolheap.com/test-mail-server-tool/
It worked right off the bat for me, hope this helps you.
...
Use C++ with Cocoa Instead of Objective-C?
... create GUI for Mac OS X, but we must link against Cocoa framework.
/*
* test1.cpp
* This program shows how to access Cocoa GUI from pure C/C++
* and build a truly functional GUI application (although very simple).
*
* Compile using:
* g++ -framework Cocoa -o test1 test1.cpp
*
* that wil...
Swift: Testing optionals for nil
...I have this weird situation where I cannot figure out how to appropriately test for optionals.
14 Answers
...
Wait until all jQuery Ajax requests are done?
...quest might finish before the second even starts
semaphore++;
$.get('ajax/test1.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test2.html', function(data) {
semaphore--;
...
html5 localStorage error with Safari: “QUOTA_EXCEEDED_ERR: DOM Exception 22: An attempt was made to
...to removeItem are ignored.
I believe the simplest fix (although I haven't tested this cross browser yet) would be to alter the function isLocalStorageNameSupported() to test that you can also set some value.
https://github.com/marcuswestin/store.js/issues/42
function isLocalStorageNameSupported()...