What are operators used for in the Dart language?

Operators in Dart allow manipulating values and variables by performing various operations. These include arithmetic, conditional, logical, and other operators.

Main categories of operators:

• Arithmetic: +, -, *, /, %
• Equality and relational operators: ==, !=, >, <, >=, <=
• Assignment operators: =, +=, -=, *=, /=
• Logical: &&, ||, !
• Bitwise operators: &, |, ^, ~, <<, >>
• Special operators:
  • .. (cascade operator)
  • ?. (conditional member access)
  • ?? (null check operator)
  • is (type check)
  • as (type cast)

Example usage:

int a = 10;
int b = 5;

// Arithmetic operator
int sum = a + b; // 15

// Relational operator
bool isEqual = (a == b); // false

// Logical operator
bool condition = (a > 5 && b < 10); // true

// Assignment with operation
 a += 2; // a is now 12

// Cascade operator
var buffer = StringBuffer()
  ..write('hello')
  ..write('world'); // buffer contains "helloworld"

// Null check operator
String? name = null;
String displayName = name ?? 'Guest'; // displayName will be 'Guest'