agoiabel

pragma solidity ^0.5.3;

contract Mapping {
    
    mapping(address => uint[]) scores;    
    
    function manipulateArrayMap() external {
        scores[msg.sender].push(1);             //assign a value; 
        scores[msg.sender].push(2);             //assign another element
        

agoiabel

pragma solidity ^0.5.3;

contract Mapping {
    
    mapping(address => uint) balances;
    
    function manipulateMap() external {
        balances[msg.sender] = 100;             //assign a value; 
        
        balances[msg.sender]                    //read a value;

agoiabel

pragma solidity ^0.5.3;

contract ArraySolidity {

    /** Visible external */
    function functionExternal(uint[] calldata myArg) external returns(uint[] memory) {
        uint[] memory newArray = new uint[](10);
        
        newArray[0] = 1;
        

agoiabel

pragma solidity ^0.5.3;

contract MemoryArray {
    /**
     *       These are temporary arrays and only exists when you are executing a function
     *       Must have a fixed size and must be declared inside a function
     *       You cannot run a for loop in a memory array
     */
    function memoryArray() public {
        uint[] memory newArray = new uint[](10);

agoiabel

pragma solidity ^0.5.3;

contract{
    uint[] myArray;
    
    function manipulateArray() external {
        myArray.push(1);     // add an element to the array
        myArray.push(3);     // add another element to the array
        
        myArray[0];          // get the element at key 0 or first element in the array  

agoiabel

pragma solidity ^0.5.3;

contract Array {
  uint[] intergerArray;       //sample showing initialization of an array of integers
  
  bool[] boolArray;           //sample showing initialization of an array of booleans
  
  address[] addressArray;     //sample showing initialization of an array of address etc.
}

agoiabel

renderPageNumbers = pageNumbers.map(number => {
  let classes = this.state.current_page === number ? styles.active : '';

  if (number == 1 || number == this.state.total || (number >= this.state.current_page - 2 && number <= this.state.current_page + 2)) {
    return (
      <span key={number} className={classes} onClick={() => this.makeHttpRequestWithPage(number)}>{number}</span>
    );
  }
});

agoiabel

import React, { Component } from 'react';
import styles from './App.module.css';

class App extends Component {


  state = {
    users: null,
    total: null,
    per_page: null,

agoiabel

<div className={styles.pagination}>
  <span onClick={() => this.makeHttpRequestWithPage(1)}>&laquo;</span>
  {renderPageNumbers}
</div>

agoiabel

renderPageNumbers = pageNumbers.map(number => {
  let classes = this.state.current_page === number ? styles.active : '';

  return (
    <span key={number} className={classes} onClick={() => this.makeHttpRequestWithPage(number)}>{number}</span>
  );
});