Structure

[] (array access)
= (assign)
, (comma)
// (comment)
{} (curly braces)
delete
. (dot)
false
#include
loop()
/* */ (multiline comment)
new
null
() (parentheses)
return
; (semicolon)
setup()
true
void

Data

Primitive

boolean
byte
char
double
float
int
long
unsigned char
unsigned int
unsigned long

Composite

String
Vector
array

Conversion

boolean()
byte()
char()
float()
int()
long()
splitString()
toAscii()
toLowerCase()
toUpperCase()

Bit, byte and word handling

bit()
bitRead()
bitWrite()
highByte()
lowByte()
makeWord()

Character Classification

isAlpha()
isAlphaNumeric()
isAscii()
isControl()
isDigit()
isGraph()
isHexadecimalDigit()
isLowerCase()
isPrintable()
isPunct()
isSpace()
isUpperCase()
isWhitespace()

Control

Relational Operators

== (equality)
> (greater than)
>= (greater than or equal to)
!= (inequality)
< (less than)
<= (less than or equal to)

Iteration

for()
while()

Conditionals

break
case
default
else
if()
switch()

Logical Operators

&& (logical AND)
! (logical NOT)
|| (logical OR)

Input/Output

Pin digital Input/Output

digitalRead()
digitalWrite()
pinMode()
shiftOut()

Port digital Input/Output

portMode()
portRead()
portWrite()

Pin analog Input

analogRead()

Pin PWM (analog) Output

analogWrite()

Time

delay()
delayMicroseconds()
micros()
millis()

Pulse Input (polled)

pulseIn()

Pulse output generation

pulseOut()
pulseRunning()
pulseStop()

Interrupts

attachInterrupt()
detachInterrupt()
interruptMode()
interrupts()
noInterrupts()

Tone output generation

noTone()
tone()

Math

Operators

+= (add assign)
-= (subtract assign)

Bitwise Operators

& (bitwise AND)
&= (bitwise AND and assign)
| (bitwise OR)
|= (bitwise OR and assign)
^ (bitwise XOR)
<< (bitwise bit shift left)
>> (bitwise bit shift right)
˜ (bitwise ones complement)

Calculation

abs()
ceil()
constrain()
exp()
fabs()
floor()
fma()
fmax()
fmin()
fmod()
ldexp()
log()
log10()
map()
max()
min()
pow()
round()
signbit()
sq()
sqrt()
square()
trunc()

Trigonometry

acos()
asin()
atan()
atan2()
cos()
cosh()
degrees()
hypot()
radians()
sin()
sinh()
tan()
tanh()

Random

random()
randomSeed()

Operator

+ (addition)
-- (decrement)
/ (divide)
++ (increment)
- (minus)
% (modulo)
* (multiply)
- (negation)

Constants

CHANGE
FALLING
HALF_PI (1.57079...)
HIGH
INPUT
LOW
LSBFIRST
MSBFIRST
OUTPUT
PI (3.14159...)
RISING
TWO_PI (6.28318...)