Solidity Utils

We want to improve solidity basic skill and we also create a basic library for learning and practice. You can see how to use as below:

pragma solidity ^0.4.16;
import "github.com/20Scoops-CNX/solidity-utils/lib/ListInteger.sol";
import "github.com/20Scoops-CNX/solidity-utils/lib/Strings.sol";
import "github.com/20Scoops-CNX/solidity-utils/lib/Integers.sol";
contract ExampleContract {
    using ListInteger for *;
    using Strings for string;
    using Integers for uint;
    uint[] items;
}

ListInteger

• add(uint)
• remove()
• removeByValue(uint)
• removeByIndex(uint)
• find(uint) : uint
• sort() : uint[]
• sortDESC() : uint[]
• getSize() : uint
• sum() : uint

add(uint)

Add unsigned integer to array

function example() public view returns (uint[]) {
    items.add(99);
    return items;
}

remove()

Remove item last index like function pop() in array

function example() public view returns (uint[]) {
    items.remove();
    return items;
}

removeByValue(uint)

Remove item by value in array

function example() public view returns (uint[]) {
    items.removeByValue(99);
    return items;
}

removeByIndex(uint)

Remove item by index in array start at 0

function example() public view returns (uint[]) {
    items.removeByIndex(0);
    return items;
}

find(uint) : uint

Find index by value in array

function example() public view returns (uint) {
    uint index = items.find(99);
    return index;
}

sort() : uint[]

Sort ascending unsigned integer in array

function example() public view returns (uint[]) {
    return items.sort();
}

sortDESC() : uint[]

Sort descending unsigned integer in array

function example() public view returns (uint[]) {
    return items.sortDESC();
}

getSize() : uint

Get size array

function example() public view returns (uint) {
    uint size = items.getSize();
    return size;
}

sum() : uint

Sum unsigned integer in array

function example() public view returns (uint) {
    uint result = items.sum();
    return result;
}

Strings

• concat(string)
• length() : uint
• replaceAll(bytes1, bytes1) : string
• replace(bytes1, bytes1) : string
• compareTo(string) : bool

concat(string)

Join two strings

function example() {
    string memory str = "20scoops";
    str = str.concat(" ").concat("CNX");
}

length() : uint

Get the length of a string

function example() returns (uint) {
    string memory str = "20scoops CNX";
    return str.length();
}

replaceAll(bytes1, btyes1) : string

Replace all character in string

function example() public view returns (string) {
    string memory str = "20scoops CNX ";
    return str.replaceAll(" ", "");
}

replace(bytes1, bytes1) : string

Replace character in string

function example() public view returns (string) {
    string memory str = "20scoops CNX ";
    return str.replace(" ", "");
}

compareTo(string) : bool

Compare two string

function example() public view returns (bool) {
    string memory str = "20scoops CNX";
    return str.compareTo("20scoops");
}

Intergers

• parseInt(string) : uint
• toString() : uint
• plus(uint) : uint
• minus(uint) : uint
• divide(uint) : uint
• multiply(uint) : uint
• mod(uint) : uint

parseInt(string) : uint

Convert string to unsigned integer

function example() public view returns (uint) {
    return Integers.parseInt("99.00");
}

toString() : uint

Convert unsigned integer to string

function example(uint value) public view returns (string) {
    return value.toString();
}

plus(uint) : uint

Plus unsigned integer

function example() public view returns (uint) {
    uint myInt = 5;
    return myInt.plus(5);
}

minus(uint) : uint

Minus unsigned integer

function example() public view returns (string) {
    uint myInt = 5;
    return myInt.minus(5);
}

divide(uint) : uint

Divide unsigned integer

function example(uint value) public view returns (uint) {
    uint myInt = 5;
    return myInt.divide(5);
}

multiply(uint) : uint

Multiply unsigned integer to string

function example() public view returns (uint) {
    uint myInt = 5;
    return myInt.multiply(5);
}

mod(uint) : uint

Modular unsigned integer

function example() public view returns (string) {
    uint myInt = 500;
    return myInt.mod(6);
}