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What is PECS (Producer Extends Consumer Super)?
...y type. For the type Animal we can make the type Animal[]
covariant: a Cat[] is an Animal[];
contravariant: an Animal[] is a Cat[];
invariant: an Animal[] is not a Cat[] and a Cat[] is not an Animal[].
Java Examples:
Object name= new String("prem"); //works
List<Number> numbers = new Ar...
How to check size of a file using Bash?
...
If you are looking for just the size of a file:
$ cat $file | wc -c
> 203233
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What is the difference between an annotated and unannotated tag?
...or lightweight tags, the SHA-1 points directly to a commit:
git tag light
cat .git/refs/tags/light
prints the same as the HEAD's SHA-1.
So no wonder they cannot contain any other metadata.
annotated tags point to a tag object in the object database.
git tag -as -m msg annot
cat .git/refs/tags/a...
Why do we need a fieldset tag?
...out:
http://usability.com.au/2013/04/accessible-forms-1-labels-and-identification/
The HTML 4 elements fieldset and legend allow you to layout and organise a large form with many different areas of interest in a logical way without using tables. The fieldset tag can be used to create boxes around s...
Which commit has this blob?
... Good to use in conjunction with git rev-list --objects --all | git cat-file --batch-check='%(objecttype) %(objectname) %(objectsize) %(rest)' | awk '/^blob/ {print substr($0,6)}' | sort --numeric-sort --key=2 -r | head -n 20, which returns you a top 20 largest blobs. Then you can pass blob I...
Insert a line at specific line number with sed or awk
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inserts at line 8
8 This is Line 8
into file FILE
-i does the modification directly to file FILE, no output to stdout, as mentioned in the comments by glenn jackman.
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Execute and get the output of a shell command in node.js
...ing a rejected promise on failed commands, which can be handled with try / catch inside the async code.
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ElasticSearch: Unassigned Shards, how to fix?
...-assign shards to nodes dynamically. However, if you've disabled shard allocation (perhaps you did a rolling restart and forgot to re-enable it), you can re-enable shard allocation.
# v0.90.x and earlier
curl -XPUT 'localhost:9200/_settings' -d '{
"index.routing.allocation.disable_allocation": ...
How do I dump the data of some SQLite3 tables?
...d bonus, it still works if you have a dumped SQL file hanging around, just cat database.sql | grep '^INSERT' > database_inserts.sql (same for schema, replace with grep '^CREATE'
– trisweb
Jun 4 '12 at 17:52
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To ternary or not to ternary? [closed]
I'm personally an advocate of the ternary operator: () ? : ; I do realize that it has its place, but I have come across many programmers that are completely against ever using it, and some that use it too often.
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