In Dart, code is run in a main function, so the general structure of a dart file is:

//Imports and other stuff out here

void main(){
	//Main Code goes here

}

Dart CLI Shortcuts:

Make sure to cd into the correct path before using the commands.

dart create -t console-simple AppNameHere

creates a simple project within the named project folder.

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dart run

To run the file.

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dart fix --apply

To attempt to fix issues in the code (e.g. variables not being constants/finals)

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dart format FileNameHere.dart

Condenses/reformats dart code.

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dart compile exe|js FileNameHere.dart

Compiles to aforementioned file type (there are more but these are the ones I’ll probably use).

Imports:

Importing a separate file:

Use file name (with .dart suffix and subpath if applicable*) in a string

import 'some_file.dart';

import 'lib/library.dart';

Importing a default library:

Use dart: prefix and then the package/library.

import 'dart:math';

Importing a pub package (dart library)

Follow instructions in the Installing tab of the library.

Comments and Print:

Comments:

Similar to C++:

// single line comment

/*
Multi-line comment
*/

Print Statements:

print('Hello, World!');

To print variables, include a $ before the variable, or $ for longer snippets of code:

String name = 'John';

print('Hi my name is $name.');
print('Math: ${1 + 10}');

Control Flow:

Conditionals:

String color = 'blue';

if (color == 'red'){
	//
} else if (color == 'green'){
	//
} else{
	print('Color is blue!');
}

//Switch/Case statements: 
switch (color){
	case 'red':
		//
	case 'green':
		//
	case 'blue':
		//
	default:
		print('what the heck is this color?');

}

//Single line if statement:
if (color == 'green') print('This is green!');

//Assertion, stops code if the boolean is false, good for dev:
assert(color == 'blue');

Loops:

//for loop:
for (var i = 0; i < 10; i++){
	print(i);
}

//while loop:
int j = 0;
int answer = 0;
while (j < 20){
	answer = 10 - j;
	print(answer);

	//Break/continue
	if(answer == 0){
		//continue;
		break;
	}
}

//do/while loop:
int k = 0;
do{
	print(k);
} while(k<100);

Further Reference:

Fireship

General Reference/Intro to Dart

Dart Detailed Reference