Thursday, 21 October 2021

write 1000 uniq perl interview questions and answers to master in perl part 2

 251. Q: In Perl, how can you find the position of a substring within a string?

1A: In Perl, you can find the position of a substring within a string by using the `index` function. Here is an example: 2 3```perl 4use strict; 5use warnings; 6 7my $string = 'Hello, World! World is beautiful.'; 8my $substring = 'World'; 9 10my $position = index $string, $substring; 11 12if ($position == -1) { 13 print "The substring was not found in the string.\n"; 14} else { 15 print "The substring was found at position: $position\n"; 16} 17``` 18 19In this example, the script finds the position of the substring `'World'` within the string `'Hello, World! World is beautiful.'` and prints the resulting position.

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Monday, 9 June 2025

Checking for Empty, Undefined, or Null Strings in JavaScript

When working with JavaScript, you’ll frequently need to verify if a string is empty, undefined, or null. This is especially common in web applications where user input must be validated. In this post, we’ll explore multiple ways to check for empty or undefined strings, using various methods, each with its own pros and cons.

Basic Falsy Check

In JavaScript, the concept of truthy and falsy values plays a significant role. A falsy value is a value that translates to false when evaluated in a Boolean context. The most common falsy values are:

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Friday, 8 November 2024

Reading a File into a Java String: Modern Techniques

Java provides multiple ways to read the entire contents of a file into a single String. From traditional methods using BufferedReader to modern approaches with NIO utilities, there’s a technique to suit different Java versions and project requirements. Here’s a guide to some of the most popular methods, including options for Java 7 and newer, as well as some third-party alternatives.

1. Using Files.readString() in Java 11+

For Java 11 and later, the Files.readString() method offers a simple and efficient way to read the entire content of a file into a String. This method preserves line terminators.

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Saturday, 3 May 2025

How to Check if a String Contains a Substring in Bash

When it comes to string manipulation in Bash, checking if a string contains a specific substring is a common requirement. In this post, we’ll explore various methods to achieve this, ranging from simple conditional checks to more advanced techniques.

Using Conditional Expressions

The simplest way to check if a string contains a substring is by using conditional expressions. Here’s how you can do it:

string="My string"
substring="foo"

if [[ $string == *"$substring"* ]]; then
    echo "It's there!"
else
    echo "Not found."
fi
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Friday, 19 April 2024

Comparing Strings in Java with Special Considerations for Null and Empty Values


In Java development, handling String comparisons where either or both strings might be null or empty (i.e., "") is a common challenge. Specifically, situations arise where null values should logically equate to empty strings. This requirement is particularly useful in applications dealing with user inputs or data interchange where the absence of a string (null) is effectively the same as an empty string. Today, we’ll explore different methods to implement this comparison logic in Java.

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Monday, 23 June 2025

Mastering PHP: Converting Variables to Strings Like a Pro

When working in PHP, you may need a way to convert various data types into strings, similar to Java or .NET’s toString() method. In PHP, there isn’t a direct toString() method, but PHP provides several ways to achieve similar functionality. Let’s explore a few approaches, including examples for different data types and complex objects.

1. Type Casting: Converting Variables to Strings

The simplest way to convert a variable to a string is by type casting. This method works effectively for scalar values (integers, booleans, floats).

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Thursday, 28 October 2021

Top 500 unique perl programming interview questions and answers to master in perl regular expression programs - part1

 

  1. How can I remove leading and trailing white spaces from a string in Perl?
perl
1$str = " Hello World! "; 2$str =~ s/^\s+|\s+$//g; 3print $str; # Output: "Hello World!"
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Thursday, 13 February 2025

How to Convert an InputStream into a String in Java

When working with Java, it’s common to encounter situations where you need to convert an InputStream into a String. Whether you’re reading data from a file, network socket, or other sources, understanding how to efficiently perform this conversion is crucial.

Why Convert an InputStream to a String?

An InputStream is a stream of bytes that you can read from. However, when working with text data, you often need to convert these bytes into a String. For example, you might want to:

  • Log the content of a stream.
  • Process text data from a file.
  • Pass text data between different parts of an application.
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