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Uses for Optional
Having been using Java 8 now for 6+ months or so, I'm pretty happy with the new API changes. One area I'm still not confident in is when to use Optional . I seem to swing between wanting to use it everywhere something may be null , and nowhere at all.
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Equation for testing if a point is inside a circle
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if dx>R then
return false.
if dy>R then
return false.
Now imagine a square diamond drawn inside this circle such that it's vertices touch this circle:
if dx + dy <= R then
return true.
Now we have covered most of our space and only a small area of this circle remains ...
What is the significance of #pragma marks? Why do we need #pragma marks?
...wer showing what pragma marks look like (in that menu or wherever they are now) in the new XCode?
– user7804781
Jul 27 '18 at 17:54
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How can I create a self-signed cert for localhost?
...row next to "Trust" and choose to "Always trust". Chrome and Safari should now trust this cert. For example, if you want to use this cert with node.js:
var options = {
key: fs.readFileSync('/path/to/localhost.key').toString(),
cert: fs.readFileSync('/path/to/localhost.crt').toString(),
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Reorder levels of a factor without changing order of values
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Thank you, this worked. For some strange reason ggplot now correctly changed the order in the legend, but not in the plot. Weird.
– crangos
Mar 3 '10 at 23:57
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How to copy a row and insert in same table with a autoincrement field in MySQL?
...ou go Stored Procedure you don't go back - you're married to that database now and just adds to the costs whenever you want to change.
– Yzmir Ramirez
Feb 13 '12 at 2:41
11
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Scatterplot with too many points
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How can i change the colours? I am now getting blue to black scale, whereas i would like to get reg, green blue scale.
– user1007742
Aug 12 '14 at 13:44
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How do I show a console output/window in a forms application?
...s that changing this mysterious Visual Studio setting does). Does anyone know how this works under the hood?
– uglycoyote
Aug 14 '18 at 22:45
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Initialize a byte array to a certain value, other than the default null? [duplicate]
...ng some values. It might be simpler (which is what was asked) but I don't know that this means better. :) As always test performance if relevant. ;-)
– Chris
May 27 '11 at 9:25
1
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Why use JUnit for testing?
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That's not testing, that's "looking manually at output" (known in the biz as LMAO). More formally it's known as "looking manually for abnormal output" (LMFAO). (See note below)
Any time you change code, you must run the app and LMFAO for all code affected by those changes. Even in ...