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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 simple: the if
keyword, a condition inside the opening parenthesis (
and closing parenthesis )
, and a code block inside the opening curly bracket {
and closing curly bracket }
.
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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