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App Inventor 2 手机蓝牙及语音控制 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
来源：http://www.zsqz.com/chuangke/13.htm【学习目标】
1.掌握蓝牙客户端或服务端组件的使用；
2.学会编写手机蓝牙APP，并向Arduino发送控制指令；
3.学会编写手机语音控制程序，并能通过语音控制Arduino等设备。 【...
How to write a switch statement in Ruby
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edited Apr 4 '18 at 9:03
DTavaszi
19211 silver badge1010 bronze badges
answered Jun 4 '09 at 1:22
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Multiple left-hand assignment with JavaScript
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Actually,
var var1 = 1, var2 = 1, var3 = 1;
is not equivalent to:
var var1 = var2 = var3 = 1;
The difference is in scoping:
function good() {
var var1 = 1, var2 = 1, var3 = 1;
}
function bad() {
var var1 = var2 = var3 = 1;
}
good();
cons...
How to map with index in Ruby?
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answered Jan 15 '11 at 1:37
sepp2ksepp2k
331k4747 gold badges635635 silver badges652652 bronze badges
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ExecJS::RuntimeError on Windows trying to follow rubytutorial
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13 Answers
13
Active
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How can I draw vertical text with CSS cross-browser?
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213
Updated this answer with recent information (from CSS Tricks). Kudos to Matt and Douglas for poi...
Redirect to named url pattern directly from urls.py in django?
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edited Oct 3 '16 at 10:37
Flimm
86.4k2828 gold badges186186 silver badges191191 bronze badges
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deleting rows in numpy array
...mpy.delete method.
Suppose I have the following array x:
x = array([[1,2,3],
[4,5,6],
[7,8,9]])
To delete the first row, do this:
x = numpy.delete(x, (0), axis=0)
To delete the third column, do this:
x = numpy.delete(x,(2), axis=1)
So you could find the indices of the rows ...
Swap key with value JSON
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edited Oct 16 '19 at 13:00
KostasX
2,12611 gold badge99 silver badges2020 bronze badges
answered Apr...
What does ~~ (“double tilde”) do in Javascript?
... because the bitwise operators implicitly convert their operands to signed 32-bit integers. This works whether the operands are (floating-point) numbers or strings, and the result is a number.
In other words, it yields:
function(x) {
if(x < 0) return Math.ceil(x);
else return Math.floor(x);...