String Functions in C#

Introduction to C# String Functions

C# String Functions are like tools for shaping text in programming. They help with basic tasks like putting words together and finding out how long a text is. They can also do more advanced things, like changing how words look, taking out pieces of text, and finding specific patterns. These functions make it easier to organize code and make programs that people can use more easily.

Key Characteristics of C# String Functions

• Immutable Strings:
  In C#, strings are immutable, meaning their values cannot be changed after creation. String functions return new string instances, preserving the original string's integrity.
• Wide Range of Operations:
  C# string functions provide a wide range of operations, from simple tasks like concatenation and searching to more complex tasks like formatting dates and numbers within strings.
• Text Manipulation:
  Functions like Substring(), Replace(), Insert(), and Trim() allows you to manipulate strings by extracting, replacing, inserting, and trimming parts of the text.
• Comparison and Searching:
  Equals(), IndexOf(), Contains(), StartsWith(), and EndsWith() enable you to compare strings for equality, find substrings, and check for specific prefixes or suffixes.
• Performance and Memory:
  While string functions are powerful, it's important to consider their performance and memory implications, especially when dealing with large amounts of text.

C# String Functions

C# String Functions Examples

Clone()

• The Clone() function creates a new string object that is a copy of the original string.
• It returns a reference to the new string, which is a shallow copy of the original string. This means the content is the same, but modifying the original string won't affect the cloned string and vice versa.

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Concat()

• The Concat() function is used to concatenate two or more strings into a single string.
• It can take multiple arguments, each representing a string to be concatenated, and returns a new string that contains the combined content of all the input strings.

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Contains()

• The Contains() function checks whether a particular substring exists within the original string.
• It returns a boolean (true or false) value indicating whether the specified substring is found in the original string.

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Copy()

• The Copy() function copies a specified number of characters from the original string to a new character array.
• It takes four arguments: the starting index in the original string, the destination character array, the starting index in the destination array, and the number of characters to copy.

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Equals()

• The Equals() function compares the content of two strings to determine if they are equal.
• It returns a boolean value (true or false) based on the comparison. By default, it performs a case-sensitive comparison, but you can use overloads to specify different comparison options.

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IndexOf()

• The IndexOf() function returns the index of the first occurrence of a specified substring within the original string.
• If the substring is not found, it returns -1. You can also specify a starting index to begin searching for the substring.

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Insert()

• The Insert() function inserts a substring into the original string at the specified position.
• It takes two arguments: the index at which the substring should be inserted and the substring itself.

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Replace()

• The Replace() function replaces all occurrences of a specified substring with another substring within the original string.
• It returns a new string with the replacements performed. By default, it performs a case-sensitive replacement, but you can use overloads to specify different replacement options.

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Substring()

• The Substring() function extracts a substring from the original string, starting from the specified index and optionally for a given length.
• If no length is specified, it extracts the substring from the specified index to the end of the original string.

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Trim()

• The Trim() function removes leading and trailing white spaces from the original string.
• It returns a new string with the leading and trailing white spaces removed. If you want to remove specific characters, you can use overloads with a character array.

Example:

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