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Introduction to Dart
course content

Course Content

Introduction to Dart

Introduction to Dart

1. First Acquaintance with Dart
About DartFirst ApplicationFunction print()CommentsBasic Math Operations
2. Variables and Data Types
Data TypesVariablesProperties of NumbersBool, Equality and Relational Operators
3. Conditional Statements
if Statementif...else Statementelse-if Statementswitch-sase Statement
4. List and String
ListIndexesStringWhat are Methods?String Properties and Methods
5. Loops
Introduction to Loopswhile-LoopsDo-whilefor-LoopsIncrement and DecrementBreak and Continue

bookif Statement

if Statement

An if statement is a construct that allows you to execute a code block if a specific condition is met.

The condition is an expression that evaluates to a bool value, which can be true or false. If the condition is true, the block of code is executed. If the condition is false, the block of code is skipped.

Syntax

The syntax of the conditional operator is so simple: if keyword, condition in the parentheses ( ) and a code block in the curly brackets { }.

The open curly bracket { } opens the code block, and the close curly bracket symbol closes it.

Example 1

dart

main

copy

              
123456

            
void main() { 
   var  num=5; 
   if (num>0) {   // 5 > 0 ?
      print("number is positive"); // print if it's `true` 
   }    
}

The condition was confirmed and the block of code worked.

Example 2

dart

main

copy

              
123456

            
void main() { 
   var num = 10; 
   if (num.isNegative) {   // 10 < 0 ?
      print("number <  0"); // print if it's `true` 
   }    
}

The condition was not confirmed, and the code block did not work.

Task

What should be put instead of "?" so the program works correctly?

What should be put instead of "?" so the program works correctly?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 3. Chapter 1
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