dart keywords code example

Example 1: dart function

when you want to make a function that 
doesn't use the format return or a function that doesn't return a value
the function base will look like this:

void functionName() {

}

if its returning some thing it will look like this:

functionName() {
	
}

Example 2: dart ?? operator

int val1;
final int val2 = 20;

console.log(val1 ?? val2); //result => 20 because val1 is null

----------------------------------

final int val1 = 30;
final int val2 = 20;

console.log(val1 ?? val2); //result => 30 because val1 is not null

Example 3: dart function syntax

sum(x, y) {
	return x + y;
}

// This is where the app starts executing.
void main() {
  print(sum(3,5)); // => 8
}