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How do I replace a character at a particular index in JavaScript?
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You can't. Take the characters before and after the position and concat into a new string:
var s = "Hello world";
var index = 3;
s = s.substring(0, index) + 'x' + s.substring(index + 1);
share
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How to get the difference between two arrays in JavaScript?
...arr1
.filter(x => !arr2.includes(x))
.concat(arr2.filter(x => !arr1.includes(x)));
This way, you will get an array containing all the elements of arr1 that are not in arr2 and vice-versa
As @Joshaven Potter pointed out on his answer, you can add this to A...
Why doesn't Dictionary have AddRange?
...hods let you pass in IEqualityComparer when relevant: var combined = dict1.Concat(dict2).GroupBy(kvp => kvp.Key, dict1.Comparer).ToDictionary(grp => grp.Key, grp=> grp.First(), dict1.Comparer);
– Kyle McClellan
Mar 20 '18 at 19:32
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Interview question: Check if one string is a rotation of other string [closed]
...nd s2 are of the same length. Then check to see if s2 is a substring of s1 concatenated with s1:
algorithm checkRotation(string s1, string s2)
if( len(s1) != len(s2))
return false
if( substring(s2,concat(s1,s1))
return true
return false
end
In Java:
boolean isRotation(String s1,St...
How to make a flat list out of list of lists?
...ssentially a wrapper around timeit), and found
functools.reduce(operator.iconcat, a, [])
to be the fastest solution, both when many small lists and few long lists are concatenated. (operator.iadd is equally fast.)
Code to reproduce the plot:
import functools
import itertools
import numpy
...
Which is the preferred way to concatenate a string in Python?
Since Python's string can't be changed, I was wondering how to concatenate a string more efficiently?
12 Answers
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How do you reverse a string in place in JavaScript?
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string concatenation is expensive. Better to build an array and join it or use concat().
– Bjorn
Jun 6 '09 at 5:52
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Execute command on all files in a directory
...cript that will go into a directory, execute the command on each file, and concat the output into one big output file.
10 A...
Initialization of an ArrayList in one line
...e:
Stream<String> strings = Stream.of("foo", "bar", "baz");
You can concatenate Streams:
Stream<String> strings = Stream.concat(Stream.of("foo", "bar"),
Stream.of("baz", "qux"));
Or you can go from a Stream to a List:
import static java.util.strea...
String vs. StringBuilder
...ance difference is significant. See the KB article "How to improve string concatenation performance in Visual C#".
I have always tried to code for clarity first, and then optimize for performance later. That's much easier than doing it the other way around! However, having seen the enormous perfo...