Flutter elif - Dart

Introduction

Flutter elif is a powerful control structure in Dart language. It is used to select one of several blocks of code to execute based on multiple conditions.

In other languages, it is called if...else if...else statements. However, in Dart, it is written as if... else if... else if... else. It is pronounced as "if-elif-else".

Syntax

The syntax for if... elif... else statement in Dart is as follows:

if (condition1) {
  // code to execute if condition1 is true
} else if (condition2) {
  // code to execute if condition2 is true
} else if (condition3) {
  // code to execute if condition3 is true
} else {
  // code to execute if all conditions are false
}

The else clause is optional. You can have as many else if clauses as you want. The conditions are evaluated in order, and the code in the first matching block is executed. If none of the conditions are true, the code in the else block is executed.

Example

void main() {
  int age = 18;

  if (age < 18) {
    print("You are not eligible to vote.");
  } else if (age >= 18 && age < 60) {
    print("You are eligible to vote.");
  } else {
    print("You are a senior citizen. Your vote is valuable.");
  }
}

In this example, if the age is less than 18, the code in the first block will be executed, otherwise if the age is between 18 and 60 (inclusive), the code in the second block will be executed. If the age is greater than or equal to 60, the code in the third block will be executed.

Conclusion

Flutter elif is a useful control structure in Dart that allows you to execute different blocks of code based on multiple conditions. It is an important concept to master when learning to code in Dart language.