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Supplier<Sequence<String>> cannot be iterated more than once


Supplier<Sequence<String>> cannot be iterated more than once

By : user3100294
Date : January 12 2021, 01:40 AM
should help you out
Sequence type that represents lazily evaluated collections. Top-level functions for instantiating sequences and extension functions for sequences.
code :
val linesSupplier: List<String> = inputStream.bufferedReader().lines().toList()
val linesSupplier: Supplier<Sequence<String>> = Supplier { FileInputStream("C:\\test.txt").bufferedReader().lines().asSequence() }


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Why is it not safe to modify sequence being iterated on?

Why is it not safe to modify sequence being iterated on?


By : user2170726
Date : March 29 2020, 07:55 AM
should help you out Without getting too technical:
If you're iterating through a mutable sequence in Python and the sequence is changed while it's being iterated through, it is not always entirely clear what will happen. If you insert an element in the sequence while iterating through it, what would now reasonably be considered the "next" element in the sequence? What if you delete the next object?
Cycle detection in non-iterated sequence

Cycle detection in non-iterated sequence


By : Shrinivas Prabhu
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The tortoise-hare algorithm uses same address to identify cycles. This problem requires a different sort of algorithm. Some form of trie or structure such as LZW compression, would be where I would look for a solution.
Loop is creating array when iterated two times but creating string when iterated only one time in PHP

Loop is creating array when iterated two times but creating string when iterated only one time in PHP


By : project_pgw
Date : March 29 2020, 07:55 AM
around this issue What you describe is the normal behaviour. As you're dealing with redirects here, there can be more than one request with get_headers as it performs a HTTP GET request by default.
With the http://pars.mp3hunt.me/r2.php URL you see a single location entry (and therefore a string) but with the http://pars.mp3hunt.me/r1.php URL you see two location entries (and therefore an array).
code :
$urls = [
    "http://pars.mp3hunt.me/r2.php",
    "http://pars.mp3hunt.me/r1.php"
];

foreach ($urls as $url) {
    $headers = get_headers($url, 1);

    echo $url, ":\n";
    var_dump($headers['Location']);
    echo "\n";
}
http://pars.mp3hunt.me/r2.php:
string(29) "http://pars.mp3hunt.me/r3.php"

http://pars.mp3hunt.me/r1.php:
array(2) {
  [0]=>
  string(29) "http://pars.mp3hunt.me/r2.php"
  [1]=>
  string(29) "http://pars.mp3hunt.me/r3.php"
}
How to find the Supplier number for those suppliers who supply all parts that are supplied by another by supplier in SQL

How to find the Supplier number for those suppliers who supply all parts that are supplied by another by supplier in SQL


By : Mischka
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I am trying to find the SNO for the Supplier that supplied all parts that is supplied that by another by Supplier. , this is how I achieved the result:
code :
create table MyTable (
  Supplier varchar(20),
  Part varchar(20),
  SomeOrder int
)

insert into MyTable values 
('S1', 'P1', 100),
('S1', 'P2', 200), 
('S2', 'P1', 300), 
('S2', 'P2', 100),
('S3', 'P1', 400),
('S4', 'P1', 100), 
('S4', 'P2', 200)
---------------------------

-- temporary table to store all parts of a supplier
CREATE TABLE #tmp (Part varchar(20))

-- put your desired provider here
declare @Supplier varchar(20) = 'S2'

-- select all parts of this supplier
insert into #tmp
select Part from MyTable where Supplier = @Supplier

-- count how many parts this supplier has
declare @partCount int
select @partCount = count(*) from #tmp

-- select all suppliers that have all the parts (i.e. count = @partCount)
select innerTbl.Supplier from (
    select m.Supplier, m.Part
    from MyTable m
    inner join #tmp t on t.Part = M.Part
  ) innerTbl
 group by innerTbl.Supplier
 having Count(innerTbl.Supplier) = @partCount 
 and innerTbl.Supplier <> @Supplier
Practical uses for the option to pass `Supplier` as a message supplier in JUnit 5

Practical uses for the option to pass `Supplier` as a message supplier in JUnit 5


By : Sangwhan Moon
Date : March 29 2020, 07:55 AM
This might help you When building message is expensive
If I remember correctly, we - the JUnit 5 team - introduced the supplier variant for cases in which building the message string is costly, eg due to accessing a database. You’d only want to do this if necessary, ie in case of failure.
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