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Java logical operator short-circuiting
...operators "short-circuit", meaning they don't evaluate the right-hand side if it isn't necessary.
The & and | operators, when used as logical operators, always evaluate both sides.
There is only one case of short-circuiting for each operator, and they are:
false && ... - it is not ne...
How to retry after exception?
... while True:
try:
# do stuff
except SomeSpecificException:
continue
break
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Any reason to prefer getClass() over instanceof when generating .equals()?
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If you use instanceof, making your equals implementation final will preserve the symmetry contract of the method: x.equals(y) == y.equals(x). If final seems restrictive, carefully examine your notion of object equivalence to ...
When should I use a table variable vs temporary table in sql server?
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I have written quite an extensive answer on the DBA site looking at the differences between the two object types. This also addresses your question about disk vs memory (I didn't see any significant difference in behaviour between the two).
Regarding the question in the title though as to when to...
App Inventor 2 传感器应用教程 - 位置/方向/加速度传感器 · App Inventor 2 中文网
...1, 偏航)
}
function 偏航转方向(角度) {
var 方向 = "西北"
if 角度 >= 337.5 or 角度 < 22.5 {
var 方向 = "北"
} else if 角度 < 67.5 {
var 方向 = "东北"
} else if 角度 < 112.5 {
var 方向 = "东"
} else if 角度 < 157.5 {
var 方向 = "东南"
}...
How to detect which one of the defined font was used in a web page?
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I've seen it done in a kind of iffy, but pretty reliable way. Basically, an element is set to use a specific font and a string is set to that element. If the font set for the element does not exist, it takes the font of the parent element. So, what they ...
On Duplicate Key Update same as insert
I've searched around but didn't find if it's possible.
8 Answers
8
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How can I convert a zero-terminated byte array to string?
... read. You should save that number and then use it to create your string. If n is the number of bytes read, your code would look like this:
s := string(byteArray[:n])
To convert the full string, this can be used:
s := string(byteArray[:len(byteArray)])
This is equivalent to:
s := string(byteArray...
Is there a way to pass optional parameters to a function?
...le calling it and in the function definition have some code based on "only if the optional parameter is passed"
5 Answers
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Find a pair of elements from an array whose sum equals a given number
... its index.
hash(arr[i]) = i
end-for
for i=0 to arr.length - 1 do
# if K-th element exists and it's different then we found a pair
if hash(K - arr[i]) != i
print "pair i , hash(K - arr[i]) has sum K"
end-if
end-for
...