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Dart Cheat Sheet (DRAFT) by

Dart language cheat sheet.

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Keywords

abstract
 
as
 
assert
 
async
 
await
 
base
 
break
 
case
 
catch
 
class
 
const
 
continue
 
covariant
 
default
 
deferred
 
do
 
dynamic
 
else
 
enum
 
export
 
extends
 
extension
 
external
 
factory
 
false
 
final
 
get
 
finally
 
for
 
Function
 
import
 
hide
 
if
 
implements
 
late
 
in
 
interface
 
is
 
null
 
library
 
mixin
 
new
 
part
 
of
 
on
 
operator
 
sealed
 
required
 
rethrow
 
return
 
super
 
set
 
show
 
static
 
throw
 
switch
 
sync
 
this
 
typedef
 
true
 
try
 
type
 
with
 
var
 
void
 
when
   
while
 
yield

Naming Conven­tions

Classes
UpperC­ame­lCase
MyClass
Enums
UpperC­ame­lCase
MyEnum
Extensions
UpperC­ame­lCase
MyExte­nsion
Typedefs
UpperC­ame­lCase
MyTypeDef
Fields
lowerC­ame­lCase
myField
Private fields
_lower­Cam­elCase
_myField
Functions
lowerC­ame­lCase
myFunction
Parameters
lowerC­ame­lCase
myPara­meter
Variables
lowerC­ame­lCase
myVariable
Constants
lowerC­ame­lCase
myConstant
Direct­ories, Source files, Packages & Imports
lowerc­ase­_wi­th_­und­ers­cores
my_pac­kage, main.dart

Operators

Arithmetic operators
 
+
, 
-
, 
*
, 
/
, 
~/
, 
%
Assignment operators
 
=
, 
+=
, 
-=
, 
*=
, 
/=
, 
~/=
, 
%=
, 
&=
, 
|=
, 
^=
, 
<<=
, 
>>=
, 
>>>=
Bitwise operators
 
&
, 
|
, 
^
, 
~
, 
<<
, 
>>
, 
>>>
Comparison operators
 
==
, 
!=
, 
<
, 
>
, 
<=
, 
>=
Condit­ional operator
 
? :
Logical operators
 
!
, 
&&
, 
||
Function applic­ation
 
()
Subscript access
 
[]
Condit­ional subscript access
 
?[]
Member access
 
.
Condit­ional member access
 
?.
Non-null assertion operator
 
!
Unary operators
 
++
, 
--

Comments

// This is a single line comment.
 
/* This is a multi-line comment. */
 
/// This is a doc comment.

String Interp­olation

$expr
${expr}
 
int a = 2;

int b = 2;

print
("Sum of $a and $b is ${a + b}"); // Sum of 2 and 2 is 4

String Concat­enation

expr1 + expr2 + ... + exprn
 
String str1 = 
"
Hello
";

String str2 = 
"
World
";

print
(str1 + " " + str2);

Main Function

void main() {
  // Some code
}

Variables

T variableName = value;
 
int age = 21;

double height = 1.75;

var
 date
Of
Birth
 = 2003;

String name = 
"
Jack
";

bool isHuman = true;

Imports

import library_name;
 
import 'dart:io';

import
 'dart
:math';

import
 'dart
:core';
  

Branches

if (condition) {
...

}
else if (condition) {
... 

} else {
... 

}
 
switch (value) {
case value1:
...

break;
case value2:
...

break;
...

default:
...

break;
}

Loops

for (
...
; condition;
...
) {
...

}
 
while (condition) {
...

}
 
do {
...

} while (condition);
 

Functions

T
functi­onName
(
parame­ter(s)
) {
...
}
 
static T
functi­onName
(
parame­ter(s)
) {
...
}