Strings in Dart
A Dart String is a sequence of characters enclosed within single (‘ ‘) or double (” “) quotation marks. Strings can contain letters, numbers, symbols, and even special characters like newline (\n) or tab (\t).
Here’s a simple example:
String greeting = "Topperworld";
In the below PDF we discuss about Strings in detail in simple language, Hope this will help in better understanding.
Creating Strings:
There are several ways to create strings in Dart:
1. Using Single Quotes (‘ ‘) or Double Quotes (” “):
Strings can be created using either single quotes or double quotes. Both are equivalent, and you can choose based on your preference or to differentiate between literal quotes within the string.
Example:
String singleQuoteString = 'This is a single-quoted string';
String doubleQuoteString = "This is a double-quoted string";
2. Using Triple Quotes (”’ ”’):
Dart also supports triple quotes for creating multi-line strings, which can span across multiple lines without needing to escape special characters.
String multiLineString = ''' This is a multi-line string created using triple quotes. ''';
Basic String Operations:
Dart provides various methods and operators for performing basic operations on strings. Let’s explore some of the most commonly used ones:
1. Concatenation:
You can concatenate two strings using the ‘+’ operator or by using string interpolation.
Example:
String firstName = "Muskan";
String lastName = "Mittal";
String fullName = firstName + " " + lastName; // Using '+'
print(fullName); // Output: Muskan Mittal
2. Length:
To get the length of a string, you can use the length property.
Example:
String message = "Hello, Dart!";
int length = message.length;
3. Substring:
Dart provides the substring() method to extract a portion of a string.
Example:
String sentence = "Dart is awesome!";
String substring = sentence.substring(5, 10); // Extracts "is aw"
4. Searching:
You can search for substrings within a string using methods like contains(), startsWith(), and endsWith().
Example:
String phrase = "To be or not to be";
bool containsToBe = phrase.contains("to be"); // false
bool startsWithTo = phrase.startsWith("To"); // true
bool endsWithBe = phrase.endsWith("be"); // true
Conclusion:
In conclusion, strings are a fundamental part of Dart programming. Understanding how to create, manipulate, and work with strings effectively is essential for building robust Dart applications. By mastering the concepts and techniques covered in this guide, you’ll be well-equipped to handle any string-related tasks in your Dart projects.
Related Question
In Dart, a string is a sequence of characters, such as letters, digits, and symbols, enclosed within single (”) or double (“”) quotation marks.
You can declare a string variable in Dart using the String keyword followed by the variable name and assignment operator.
No, strings are immutable in Dart, meaning once a string is created, its value cannot be changed. However, you can create new strings by manipulating existing strings.
Yes, you can access individual characters of a string in Dart using square brackets [] with the index of the character you want to access. Strings in Dart are zero-indexed, meaning the index starts from 0.
Named parameters in Dart functions allow you to specify parameters by name when calling the function, which can improve code readability. You define named parameters by enclosing them in curly braces {} in the function declaration.
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