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Write a function that returns the longest palindrome in a given string
...ng "ABCDEFCBA".
Not that the string has "ABC" and "CBA" as its substring. If you reverse the original string, it will be "ABCFEDCBA". and the longest matching substring is "ABC" which is not a palindrome.
You may need to additionally check if this longest matching substring is actually a palindrom...
List directory in Go
...t directory (folders are included but not specially marked - you can check if an item is a folder by using the IsDir() method):
package main
import (
"fmt"
"io/ioutil"
"log"
)
func main() {
files, err := ioutil.ReadDir("./")
if err != nil {
log.Fatal(err)
}
f...
Find element's index in pandas Series
...
This solution only works if your series has a sequential integer index. If your series index is by datetime, this doesn't work.
– Andrew Medlin
Jul 7 '18 at 11:45
...
How to count certain elements in array?
...Very simple:
var count = 0;
for(var i = 0; i < array.length; ++i){
if(array[i] == 2)
count++;
}
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Logical operators for boolean indexing in Pandas
...ear when it should be True or False. Some users might assume they are True if they have non-zero length, like a Python list. Others might desire for it to be True only if all its elements are True. Others might want it to be True if any of its elements are True.
Because there are so many conflicti...
How to install a specific version of a ruby gem?
Using the command-line gem tool, how can I install a specific version of a gem?
6 Answers
...
Take the content of a list and append it to another list
I am trying to understand if it makes sense to take the content of a list and append it to another list.
7 Answers
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Syntax for if/else condition in SCSS mixin
...
You could try this:
$width:auto;
@mixin clearfix($width) {
@if $width == 'auto' {
// if width is not passed, or empty do this
} @else {
display: inline-block;
width: $width;
}
}
I'm not sure of your intended result, but setting a default value should retu...
PHP Regex to check date is in YYYY-MM-DD format
...
Try this.
$date="2012-09-12";
if (preg_match("/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/",$date)) {
return true;
} else {
return false;
}
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Algorithms based on number base systems? [closed]
...s (systems that have more than one representation of a number) are useful.
If you arrange the first digit to be non-zero or use a zeroless representation, retrieving the head of the data structure can be efficient.
Avoid cascading borrows (from taking the tail of the list) and carries (from consing ...