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App Inventor 2 手势识别扩展教程 - GestureDetector · App Inventor 2 中文网
...方向判断
var dX = 终点X - 起点X
var dY = 终点Y - 起点Y
if abs(dX) > abs(dY) {
if dX > 0 {
标签_状态.Text = "👉 右滑"
} else {
标签_状态.Text = "👈 左滑"
}
} else {
if dY > 0 {
标签_状态.Text = "👇 下滑"
} else {
...
Python - abs vs fabs
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math.fabs() converts its argument to float if it can (if it can't, it throws an exception). It then takes the absolute value, and returns the result as a float.
In addition to floats, abs() also works with integers and complex numbers. Its return type depends on the t...
Hidden Features of Java
...d it, never heard of it before.
ThreadLocals are typically not so widely known as a way to store per-thread state.
Since JDK 1.5 Java has had extremely well implemented and robust concurrency tools beyond just locks, they live in java.util.concurrent and a specifically interesting example is the j...
How do I remove duplicate items from an array in Perl?
...filtered = uniq(@array);
print "@filtered\n";
Outputs:
one two three
If you want to use a module, try the uniq function from List::MoreUtils
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What is the difference between Python's list methods append and extend?
What's the difference between the list methods append() and extend() ?
20 Answers
2...
腾讯Tencent开源框架介绍（持续更新） - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...o_cond_timedwait切出协程，等待再次不为空
while (true)
{
if (env->task_queue.empty())
{
co_cond_timedwait(env->cond, -1);
continue;
}
stTask_t* task = env->task_queue.front();
env->task_queue.pop();
printf("%s:%d consume task %d\n", __func__, __LINE__, task->...
wget/curl large file from google drive
... This one worked in July 2018! Remember to share the file and if you have the link as drive.google.com/open?id=FILE_ID just replace "open" with "uc" and simply gdown drive.google.com/uc?id=FILE_ID
– simo23
Jul 25 '18 at 15:18
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How do I check if there are duplicates in a flat list?
...
Use set() to remove duplicates if all values are hashable:
>>> your_list = ['one', 'two', 'one']
>>> len(your_list) != len(set(your_list))
True
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Rails Observer Alternatives for 4.0
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They are in a plugin now.
Can I also recommend an alternative which will give you controllers like:
class PostsController < ApplicationController
def create
@post = Post.new(params[:post])
@post.subscribe(PusherListener.new)
@...
Using mixins vs components for code reuse in Facebook React
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Update: this answer is outdated. Stay away from the mixins if you can.
I warned you!
Mixins Are Dead. Long Live Composition
At first, I tried to use subcomponents for this and extract FormWidget and InputWidget. However, I abandoned this approach halfway because I wanted a be...