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Does Typescript support the ?. operator? (And, what's it called?)
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Update: it is supported as of TypeScript 3.7 and called Optional chaining: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#optional-chaining
I can't find any reference to it whatsoever in the TypeScript language specification.
As far...
Launching Spring application Address already in use
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edited Nov 9 '19 at 13:46
answered Dec 23 '13 at 21:45
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How to keep index when using pandas merge
...merge_on col2
index
a 1 1 1
b 2 3 2
c 3 4 NaN
Note that for some left merge operations, you may end up with more rows than in a when there are multiple matches between a and b. In this case, you may need to drop duplicates.
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Approximate cost to access various caches and main memory?
...anyone give me the approximate time (in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors?
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What is the minimum I have to do to create an RPM file?
...rog-1.0/etc/toybinprog/
tar -zcvf toybinprog-1.0.tar.gz toybinprog-1.0/
3. Copy to the sources dir
cp toybinprog-1.0.tar.gz SOURCES/
cat <<EOF > SPECS/toybinprog.spec
# Don't try fancy stuff like debuginfo, which is useless on binary-only
# packages. Don't strip binary too
# Be sure bu...
How do you use “
...ower(2)
square(2) # -> [1] 4
square(4) # -> [1] 16
cube <- power(3)
cube(2) # -> [1] 8
cube(4) # -> [1] 64
The ability to manage variables at two levels also makes it possible to maintain the state across function invocations by allowing a function to modify variables in the enviro...
How to get number of entries in a Lua table?
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132
You already have the solution in the question -- the only way is to iterate the whole table wit...
Maximum length of the textual representation of an IPv6 address?
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631
45 characters.
You might expect an address to be
0000:0000:0000:0000:0000:0000:0000:0000
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How can I get the external SD card path for Android 4.0+?
Samsung Galaxy S3 has an external SD card slot, which is mounted to /mnt/extSdCard .
26 Answers
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