SQL, How to Concatenate results?
With MSSQL you can do something like this: declare @result varchar(500) set @result=”” select @result = @result + ModuleValue + ‘, ‘ from TableX where ModuleId = @ModuleId
concatenation
Most Pythonic way to concatenate strings
”.join(lst) The only Pythonic way: clear (that is what all the big boys do and what they expect to see), simple (no additional imports needed, and stable across all versions), fast (written in C) and concise (on an empty string, join elements of iterable!).
C# Append byte array to existing file
One way would be to create a FileStream with the FileMode.Append creation mode. Opens the file if it exists and seeks to the end of the file, or creates a new file. This would look something like: public static void AppendAllBytes(string path, byte[] bytes) { //argument-checking here. using (var stream = new FileStream(path, FileMode.Append)) { … Read more
Java ‘+’ operator between Arithmetic Add & String concatenation? [duplicate]
This is basic operator precedence, combined with String concatenation vs numerical addition. Quoting: If only one operand expression is of type String, then string conversion (§5.1.11) is performed on the other operand to produce a string at run time. The result of string concatenation is a reference to a String object that is the concatenation … Read more
PHP variable interpolation vs concatenation [duplicate]
Whatever works best for you works… But if you want to go for speed use this: echo ‘Welcome ‘, $name, ‘!’; The single quotes tell PHP that no interpretation is needed, and the comma tells PHP to just echo the string, no concatenation needed.
Concatenate text files with Windows command line, dropping leading lines
more +2 file2.txt > temp type temp file1.txt > out.txt or you can use copy. See copy /? for more. copy /b temp+file1.txt out.txt
How to concatenate two IEnumerable into a new IEnumerable?
Yes, LINQ to Objects supports this with Enumerable.Concat: var together = first.Concat(second); NB: Should first or second be null you would receive a ArgumentNullException. To avoid this & treat nulls as you would an empty set, use the null coalescing operator like so: var together = (first ?? Enumerable.Empty<string>()).Concat(second ?? Enumerable.Empty<string>()); //amending `<string>` to the … Read more
How to concatenate two dictionaries to create a new one? [duplicate]
Slowest and doesn’t work in Python3: concatenate the items and call dict on the resulting list: $ python -mtimeit -s’d1={1:2,3:4}; d2={5:6,7:9}; d3={10:8,13:22}’ \ ‘d4 = dict(d1.items() + d2.items() + d3.items())’ 100000 loops, best of 3: 4.93 usec per loop Fastest: exploit the dict constructor to the hilt, then one update: $ python -mtimeit -s’d1={1:2,3:4}; d2={5:6,7:9}; … Read more
Concatenation with addition in it doesn’t work as expected
+ and . have the same operator precedence, but are left associative. Means after the first concatenation: ‘(‘ . (int)$data[‘event_id’] The string got added with your key, e.g. “($data[‘event_id’]” + $key So the string gets converted into an integer in that numerical context and disappears. To solve this use parentheses () around your addition.