Solidity_study

The possible values are constants true and false.

! (logical negation)

== (equality)

!= (inequality)

Operators

Booleans

int / uint: Signed and unsigned integers of various sizes.

Keywords uint8 to uint256 in steps of 8 (unsigned of 8 up to 256 bits) and int8 to int256.

The value of a comparison is the one obtained by comparing the integer value.

x << y is equivalent to the mathematical expression x * 2**y.

Division

Modulo

Exponentiation

Integers

Fixed Point Numbers

Rational and Integer Literals

Holds a 20 byte value (size of an Ethereum address).

address

address payable

The two flavous

Type conversions

Members of Addresses

Address

Address Literals

Every contract defines its own type. You can implicitly convert contracts to contracts they inherit from. Contracts can be explicitly converted to and from the address type.

Contract Types

Enums

string memory a = unicode"Hello 😃";

Unicode Literals

Hexadecimal Literals

\\<newline> (escapes an actual newline)

\\\\ (backslash)

\\' (single quote)

\\" (double quote)

\ (newline)

\ (carriage return)

\\t (tab)

the following escape characters:

String Literals and Types

.length yields the fixed length of the byte array (read-only).

Members

Fixed-size byte arrays

bytes

string

Dynamical-sized byte array

Definition: type C is V

User Defined Value Types

Internal functions(By default)

External functions

two flavours

function (<parameter types>) {internal|external} [pure|view|payable] [returns (<return types>)]

Function types are notated as follows

pure functions can be converted to view and non-payable functions

view functions can be converted to non-payable functions

payable functions can be converted to non-payable functions

Conversions

No other conversions between function types are possible.

.address returns the address of the contract of the function.

.selector returns the ABI function selector

External (or public) functions have the following members

Function Types

Value Types

memory

storage

calldata

three data locations

Data location

T[k]

fixed sized arrays

dynamic size arrays

Definition

Arrays

Structs

Reference Types

Iterable Mappings

Mapping Types

Data Types

Order of Precedence of Operators

Operator

Variable

Control Structures

Function Calls

Creating contracts via new

Order of Evaluation of Expressions

Assignment

Scoping and Declarations

Expressions and Control Structures

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Ether Units

Time Units

Units

Units and Globally Available Variables

Contracts

Solidity.0.8.0