Dart Control flow: if-else Statement | Nested if-else statements

In Dart, control flow statements like if-else and nested if-else statements are fundamental for executing different code blocks based on certain conditions. Here's how you can use them:

if-else Statement:

The if-else statement is used to execute a block of code if a condition is true, and another block if the condition is false.

var num = 10;
if (num > 0) {
  print('Number is positive');
} else {
  print('Number is non-positive');
}

Nested if-else Statements:

Nested if-else statements involve placing one if-else statement inside another. This allows for more complex decision-making logic.

var num = 10;
if (num > 0) {
  print('Number is positive');
} else {
  if (num < 0) {
    print('Number is negative');
  } else {
    print('Number is zero');
  }
}

Simplified Nested if-else Statements using else if:

You can simplify nested if-else statements using else if.

var num = 10;
if (num > 0) {
  print('Number is positive');
} else if (num < 0) {
  print('Number is negative');
} else {
  print('Number is zero');
}

Ternary Operator for Simple if-else:

For simple conditional expressions, you can use the ternary operator (? :) to make the code more concise.

var num = 10;
var result = (num > 0) ? 'Positive' : 'Non-positive';
print(result);

These control flow constructs are essential for controlling the flow of execution in Dart programs based on different conditions. Depending on the complexity and readability requirements of your code, you can choose the appropriate approach.