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Concat all strings inside a List using LINQ
Is there any easy LINQ expression to concatenate my entire List<string> collection items to a single string with a delimiter character?
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Spring JPA @Query with LIKE
...orks for me):
@Query("SELECT u.username FROM User u WHERE u.username LIKE CONCAT('%',:username,'%')")
List<String> findUsersWithPartOfName(@Param("username") String username);
Notice: The table name in JPQL must start with a capital letter.
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StringBuilder vs String concatenation in toString() in Java
...s it might not make a
difference, but at what point do you
switch from concat to builder?
At the point where you're concatenating in a loop - that's usually when the compiler can't substitute StringBuilder by itself.
s...
In CoffeeScript how do you append a value to an Array?
...end to return the array rather than it's length.
In this case you can use .concat([newElement])
Has to be [newElement] as concat is expecting an array like the one its concatenating to.
Not efficient but looks cool in the right setting.
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Storing Data in MySQL as JSON
...REPLACE(column, '{', ''), '}', ','), '"', ''),
LOCATE(
CONCAT('myfield', ':'),
REPLACE(REPLACE(REPLACE(column, '{', ''), '}', ','), '"', '')
) + CHAR_LENGTH(CONCAT('myfield', ':')),
LOCATE(
',',
SUBSTRING(
REPLAC...
What's the best name for a non-mutating “add” method on an immutable collection?
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In situations like that, I usually go with Concat. That usually implies to me that a new object is being created.
var p = listA.Concat(listB);
var k = listA.Concat(item);
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MySQL Select Date Equal to Today
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You can use the CONCAT with CURDATE() to the entire time of the day and then filter by using the BETWEEN in WHERE condition:
SELECT users.id, DATE_FORMAT(users.signup_date, '%Y-%m-%d')
FROM users
WHERE (users.signup_date BETWEEN CONCAT(CUR...
How is null + true a string?
...e compiler, it's actually able to compile the above as:
string x = string.Concat(a, b, c, d);
which can create just a single string of exactly the right length, copying all the data exactly once. Nice.
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When is it better to use String.Format vs string concatenation?
...rmance hit, but to be honest it'll be minimal if present at all - and this concatenation version doesn't need to parse the format string.
Format strings are great for purposes of localisation etc, but in a case like this concatenation is simpler and works just as well.
With C# 6
String interpolat...
Merge 2 arrays of objects
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same result as the much simpler: arr1 = arr1.concat(arr2)
– keithpjolley
Nov 1 '16 at 14:55
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