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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...例：
// 设置不同QoS级别发布消息
when Button_PublishQoS0.Click
do
call UrsPahoMqttClient1.Publish "sensor/temperature", "25.6", 0
when Button_PublishQoS1.Click
do
call UrsPahoMqttClient1.Publish "control/light", "ON", 1
when Button_PublishQoS2.Click
do
call UrsPahoMqttClient...
How to deal with cyclic dependencies in Node.js
...
While node.js does allow circular require dependencies, as you've found it can be pretty messy and you're probably better off restructuring your code to not need it. Maybe create a third class that uses the other two to accomplish what yo...
Why use apparently meaningless do-while and if-else statements in macros?
...I'm seeing the code of the macro wrapped in what seems like a meaningless do while loop. Here are examples.
9 Answers
...
Looping through the content of a file in Bash
How do I iterate through each line of a text file with Bash ?
13 Answers
13
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AI助手能力再进化：“手术级”修改代码块 - AI 助手 - 清泛IT社区，为创新赋能！
...quot;procedure": "重置游戏","params":[],"do":[
{"set_var": "global board","value":{"list":[]}},
{"for_range":{"var": "r","from": 1,"to": 15,&...
Syntax for a single-line Bash infinite while loop
...ing up with the right combination of semicolons and/or braces. I'd like to do this, but as a one-liner from the command line:
...
How to preview git-pull without doing fetch?
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After doing a git fetch, do a git log HEAD..origin/master to show the log entries between your last common commit and the origin's master branch. To show the diffs, use either git log -p HEAD..origin/master to show each patch, or g...
Disable a group of tests in rspec?
...
How do you exactly do that on a block that has: describe 'XXXXX' do .... end
– p.matsinopoulos
Jul 13 '13 at 5:01
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Blocks and yields in Ruby
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I'm going to define a Person class initialized with a name, and provide a do_with_name method that when invoked, would just pass the name attribute, to the block received.
class Person
def initialize( name )
@name = name
end
def do_with_name
yield( @name )
en...
Using do block vs braces {}
...
Ruby cookbook says bracket syntax has higher precedence order than do..end
Keep in mind that the bracket syntax
has a higher precedence than the
do..end syntax. Consider the following
two snippets of code:
1.upto 3 do |x|
puts x
end
1.upto 3 { |x| puts x }
# SyntaxError: compi...