How to Use Deferred Function Calls in Golang
Understanding defer in Go.
Deferred Function Calls
A defer statement is an ordinary function or method call prefixed by the keyword defer. The function and argument expressions are evaluated when the statement is executed, but the actual call is def...
How to Get correct file base name in Golang
Golang path and filepath Examples.
Using filepath.Base
The number is the index of the last slash in the string. If you want to get the file's base name, use filepath.Base:
package main
import (
"fmt"
"path/filepath"
)
func main() {
path ...
How to Delete a Character from a String in Python
In Python, there are 2 ways to delete a character from a string.
Using replace Method
The str.replace(old, new[, count]) method returns a copy of the string with all occurrences of substring old replaced by new. If the optional argument count is giv...
How to Encrypt and Decrypt a String Using AES CBC in Go
In Golang, using the crypto/aes package is the easiest way to encrypt a string using AES CBC.
Ehrsam, Meyer, Smith and Tuchman invented the cipher block chaining (CBC) mode of operation in 1976. In CBC mode, each block of plaintext is XORed with the ...
How to Delete an Element from an Array in PHP
In PHP, there are 3 ways to delete an element from an array.
Using unset Function
The unset(mixed $var, mixed ...$vars): void function destroys the specified variables. For example,
$arr = ["a", "b", "d"];
unset($arr[1]);
print_r($arr);
Arr...
How to Delete the Contents of a Folder in Python
In Python, there are 2 ways to delete the contents of a folder.
Using rmtree Method
The shutil.rmtree() method deletes an entire directory tree; path must point to a directory. For example,
#!/usr/bin/python3
# Import module
import os, shutil
...
How to Remove Invalid UTF-8 Characters from a String in Go
In Golang, there are 3 ways to remove invalid UTF-8 characters from a string.
Using ToValidUTF8 Function
The strings.ToValidUTF8() function returns a copy of the string s with each run of invalid UTF-8 byte sequences replaced by the replacement str...
How to Remove the First Character of a String in Go
In Golang, using the DecodeRuneInString function is the easiest way to remove the first character of a string.
Using DecodeRuneInString Function
The following example should cover whatever you are trying to do:
package main
import (
"fmt"
...
How to Remove all Empty Strings from a List of Strings in Python
In Python, there are 3 ways to remove all empty strings from a list of strings.
Using filter Function
The filter(function, iterable) function constructs an iterator from those elements of iterable for which function returns true.
The following exam...
How to Remove an Element from a Vector in Rust
In Rust, there are 2 ways to remove an element from a vector.
Using retain Function
The vec::retain() function retains only the elements specified by the predicate.
For example,
fn main() {
let mut v = vec![1, 3, 2, 3, 4];
v.retain(|&x| x ...
How to Remove all Whitespace in a String in Python
In Python, there are 3 ways to remove all whitespace in a string.
Using str.replace Function
The str.replace(x) function returns a copy of the string with all occurrences of substring old replaced by new.
See the following example:
#!/usr/bin/p...
How to Delete a List Element by Value in Python
In Python, there are 3 ways to delete a list element by value.
Using list.remove Function
The list.remove(x) function removes the first item from the list whose value is equal to x. It raises a ValueError if there is no such item.
See the following...
How to Move a File in Python
In Python, there are 3 ways to move a file.
Using os Module
The os.rename() method renames the file or directory src to dst. If dst exists, the operation will fail with an OSError subclass in a number of cases:
#!/usr/bin/python3
# Import modu...
How to Remove Duplicates in List in Python
In Python, there are 3 ways to remove duplicates in list.
Using Built-in set Function
The built-in set() function returns a new set object, optionally with elements taken from iterable. If you later need a real list again, you can similarly pass the...
How to Get the Filename Without the Extension from a Path in Python
In Python, there are 2 ways to get the filename without the extension from a path.
Using pathlib Module
You can use .stem from pathlib to get the filename without the extension from a path, it really simple. For example,
#!/usr/bin/python3
# Im...