If you need to remove any old and unused Docker images, then you can do the following: How to Remove Old and Unused Docker Images Firstly you need to see all the images: 1 docker images You can also use ls to see the Docker Images: 1 docker image ls How to Remove a Single Docker Image The docker rmi command will remove a single Docker image as follows: 1 docker rmi <image_id> You can also use the Docker image names as follows:

If you need to convert Milliseconds to Date in Javascript, then you can do the following: How to Convert Milliseconds to Date in Javascript 1 2 let date = new Date(milliseconds); date.toString(); Common Date Conversions From Milliseconds in Javascript 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 let originalDate = new Date(milliseconds); // output: "D/MM/YYYY, H:MM:SS PM/AM" originalDate.toLocaleString(); //output: "D/MM/YYYY" originalDate.

If you need to convert a String to Title Case in Javascript, then you can do one of the following: Option 1 – Using a for loop 1 2 3 4 5 6 7 8 function titleCase(str) { str = str.toLowerCase().split(' '); for (var i = 0; i < str.length; i++) str[i] = str[i].charAt(0).toUpperCase() + str[i].slice(1); return str.join(' '); } console.log(titleCase("this is an example of some text!")); Output: This Is An Example Of Some Text!

If you need to compile multiple Java files using a single command, then you can do the following. First, it’s good to learn how to compile a Java file. How to Compile a Java File Let’s take the following Java code: 1 2 3 4 5 class HelloWorld { public static void main(String[] args) { System.out.println("Hello World"); } } To compile this, we simply do the following: 1 javac HelloWorld.java Then when we need to run it, we do:

If you need to convert JSON to a Java Object, then you can do one of the following: Option 1 – Using Gson 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 import com.

If you need to calculate the powers of Integers in Java, then you can do one of the following: Option 1 – Using for loops 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 public class Power { public static void main(String args[]){ int number = 5; int power = 3; int result = calculatePower(number,power); System.out.println(number+"^"+power+"="+result); } static int calculatePower(int num, int power){ int answer = 1; if (num > 0 && power==0){ return answer; } else if(num == 0 && power>=1){ return 0; } else{ for(int i = 1; i<= power; i++) answer = answer*num; return answer; } } } Option 2 – Using Recursion 1 2 3 4 5 6 7 8 9 10 11 12 13 14 public class Power { public static void main(String args[]){ int number = 3; int power = 3; int result = CalculatePower(number,power); System.

If you need to get today’s date in Java, then you can do one of the following: Option 1 – Using LocalDate 1 2 3 4 5 6 7 8 import java.time.LocalDate; public class GetTodayDate { public static void main(String[] args) { LocalDate todaysDate = LocalDate.now(); System.out.println(todaysDate); } } Option 2 – Using Calendar and SimpleDateFormat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 import java.

If you need to copy files from a Docker Container to the Host, then you can do one of the following: Option 1 – Using docker cp Syntax: 1 docker cp [OPTIONS] CONTAINER: SRC_PATH DEST_PATH Setup the container: 1 2 3 4 5 6 7 8 # pull the ubuntu image docker pull ubuntu # run the container locally docker run -it -d ubuntu # connect to the container docker exec -it abcde123456 /bin/bash Create a file from the container:

If you need to get the IP Address of a Docker Container, then you can do the following: Option 1 – Connect to the Bridge Network Find out the network setup: 1 docker network ls Create a docker container and assign it to the bridge network: 1 docker run -dt <nginx> Get the information about the container: 1 docker ps Inspect the network: 1 docker network inspect bridge Now you can see the container IP Address.

If you need to convert Time to a String in Go, then you can do one of the following: Option 1 – Using time.Now 1 2 3 4 5 6 7 8 9 10 11 package main import ( "fmt" "time" ) func main() { currentTime := time.Now() fmt.Println("Time: ", currentTime.String()) } Option 2 – Using time.Time.String() 1 2 3 4 5 6 7 8 9 10 11 12 package main import ( "fmt" "time" ) func main() { Time := time.

To perform a Deep Copy in Go, you can use a struct type as follows: Deep Copying using a struct in Go 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 package main import ( "fmt" ) type Dog struct { age int name string friends []string } func main() { john := Dog{1, "Harry", []string{"Steve", "Matt", "Sarah"}} jack := john jack.

Go doesn’t typically have Lambda Expressions, but synonymous to Lambdas, or Closures if Anonymous Functions for Go. How to return a value from an Anonymous Function in Go 1 2 3 4 5 6 7 8 9 10 11 12 package main import "fmt" func main() { var sum = func(n1, n2 int) int { sum := n1 + n2 return sum } result := sum(5, 3) fmt.Println("Sum is:", result) } How to return an Area from an Anonymous Function in Go 1 2 3 4 5 6 7 8 9 10 11 12 package main import "fmt" var ( area = func(l int, b int) int { return l * b } ) func main() { fmt.

If you would like to create an empty slice in Go, then you can do the following: Option 1 – Initialize an Empty Slice in Go 1 2 3 4 5 6 7 8 package main import "fmt" func main() { b := []string{} fmt.Println(b == nil) } Option 2 – Using make() 1 2 3 4 5 6 7 8 package main import "fmt" func main() { c := make([]string, 0) fmt.

If you need to run a for loop in parallel, then you can do one of the following: Option 1 – Using multiprocessing 1 2 3 4 5 6 7 8 9 import multiprocessing def sumall(value): return sum(range(1, value + 1)) pool_obj = multiprocessing.Pool() answer = pool_obj.map(sumall,range(0,5)) print(answer) Option 2 – Using joblib module 1 2 3 4 5 6 7 8 from joblib import Parallel, delayed import math def sqrt_func(i, j): time.

If you need to reverse an integer using Python, then you can do the following: Option 1 – Mathematical Palindrome Check 1 2 3 4 5 6 7 8 9 10 11 12 13 original_number = 123454321 copy_number = original_number reversed_number = 0 while original_number > 0: remainder = original_number % 10 reversed_number = reversed_number * 10 + remainder original_number = original_number // 10 if copy_number == reversed_number: print(copy_number, 'is a palindrome number') else: print(copy_number, 'is not a palindrome number') Option 2 – String Reversal Number Palindrome 1 2 3 4 5 6 number = 123454321 if number == int(str(number)[::-1]): print(number, 'is palindrome.

If you need to save a Python Dictionary object type to a file using Python, then you can do one of the following: Option 1 – Using pickle module 1 2 3 4 5 6 import pickle my_dict = { 'Bob': 31, 'Jane': 50, 'Harry': 13, 'Steve': 23} with open("dictionaryFile.pkl", "wb") as tf: pickle.dump(my_dict,tf) Then you can load the pickle file back as follows: 1 2 3 4 5 6 import pickle with open("dictionaryFile.

If you need to move files from one directory to another directory, using Python, then you can do one of the following: Option 1 – Using shutil.move() 1 2 3 4 5 6 7 8 9 10 import shutil import os file_source = 'source/directory' file_destination = 'destination/directory' get_files = os.listdir(file_source) for file in get_files: shutil.move(file_source + file, file_destination) Option 2 – Using os.replace() 1 2 3 4 5 6 7 8 9 import os file_source = 'source/directory' file_destination = 'destination/directory' get_files = os.

If you need to get the number of lines in a file, or the line count total from a file, using Python, then you can use one of the following options: Option 1 – Using open() and sum() 1 2 3 4 with open('directory/file.txt') as myfile: total_lines = sum(1 for line in myfile) print(total_lines) Option 2 – Using mmap 1 2 3 4 5 6 7 8 9 10 import mmap with open('directory/file.

If you need to read a specific line from a file using Python, then you can use one of the following options: Option 1 – Using fileobject.readlines() If you need to read line 10: 1 2 3 with open("file.txt") as f: data = f.readlines()[10] print(data) If you need to read lines 10, to 20: 1 2 3 with open("file.txt") as f: data = f.readlines()[10:20] print(data) Option 2 – Using for in fileobject 1 2 3 4 5 6 7 8 9 10 11 12 lines =[10, 20] data = [] i = 0 with open("file.

If you need to get all the files in a directory using Python, then you can do the following: Option 1 – Using os.listdir() 1 2 3 4 5 6 import os dirPath = r"/your/directory/path/" result = [f for f in os.listdir(dirPath) if os.path.isfile(os.path.join(dirPath, f))] print(result) Option 2 – Using os.walk() 1 2 3 4 5 6 import os dirPath = r"/your/directory/path/" result = next(os.walk(dirPath))[2] print(result) Option 3 – Using glob.