Dart Programming - for Loop

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The for loop is an implementation of a definite loop. The for loop executes the code block for a specified number of times. It can be used to iterate over a fixed set of values, such as an array.

Following is the syntax of the for loop.

for (initial_count_value; termination-condition; step) { 
   //statements 
}    

Example

void main() { 
   var num = 5; 
   var factorial = 1; 
   
   for( var i = num ; i >= 1; i-- ) { 
      factorial *= i ; 
   } 
   print(factorial); 
}

The program code will produce the following output −

120

The for loop has three parts: the initializer (i=num), the condition ( i>=1) and the final expression (i--).

The program calculates the factorial of the number 5 and displays the same. The for loop generates the sequence of numbers from 5 to 1, calculating the product of the numbers in every iteration.

Multiple assignments and final expressions can be combined in a for loop, by using the comma operator (,). For example, the following for loop prints the first eight Fibonacci numbers −

Example

void main() { 
   for(var temp, i = 0, j = 1; j<30; temp = i, i = j, j = i + temp) { 
      print('${j}'); 
   } 
} 

It should produce the following output −

1 
1 
2 
3 
5
8 
13 
21