Contenu du cours
Introduction to Dart
Introduction to Dart
if Statement in Dart
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 opening curly bracket { } marks the beginning of a code block, and the closing curly bracket indicates its end.
Example 1
main
void main() { var num=5; if (num>0) { // 5 > 0 ? print("number is positive"); // Print if it's `true` } }
This program demonstrates an if statement by declaring a variable num with a value of 5 and checking if num is greater than 0. Since the condition num > 0 is true, the code block inside the if statement executes, printing "number is positive" to the console.
Example 2
main
void main() { var num = 10; if (num.isNegative) { // 10 < 0 ? print("number < 0"); // Print if it's `true` } }
This code checks if the number is negative using the isNegative method. If the number is less than zero, it prints "number < 0", but since the value of num is 10, which is not negative, the condition is not met and nothing is printed.
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