DEV Community: zak100

Comparing strings

zak100 — Wed, 19 Oct 2022 05:05:14 +0000

var assert = require('assert');
const path = require("path");
const fs = require("fs");
//const F5 = artifacts.require("F5")
//const ST5= artifacts.require("ST5")

module.exports = async function(callback) {
try {
//var ctr =0;
let Str = [];
Str = "fundame"
Str2 = []
for(i=0; i<7;i++){
ch = Str.charAt(i)
Str2[i] = ch
Str2.join("");
console.log(Str2)
if(Str2 == "fundame")
console.log("Found")
else
console.log("Not found")
}

}//try
catch(error) {
console.log(error)
}

callback()
}

[ 'f' ]
Not found
[ 'f', 'u' ]
Not found
[ 'f', 'u', 'n' ]
Not found
[ 'f', 'u', 'n', 'd' ]
Not found
[ 'f', 'u', 'n', 'd', 'a' ]
Not found
[ 'f', 'u', 'n', 'd', 'a', 'm' ]
Not found
[ 'f', 'u', 'n', 'd', 'a', 'm', 'e' ]
Not found

VMException while transferring Ether from one Smart contract to other

zak100 — Thu, 29 Sep 2022 16:31:59 +0000

`pragma solidity 0.5.16;
contract SC1 {
    address owner;
    constructor() public {
        owner = msg.sender;
    }
    function transferTo(uint amount, address payable dest ) public {
        require(tx.origin == owner);
        dest.transfer(amount);
    }
    function () external payable{
    }
}`

`pragma solidity ^0.5.16;
interface SC1 {  
   function transferTo(uint amount, address payable to   ) external;
}
contract SC2{

    uint public  count;
    address owner;
    constructor() public {
        owner = msg.sender;
    }
    function() external payable  { 
      count++; 
      if (count < 2 ) 
         TxUserWallet(msg.sender).transferTo(msg.sender.balance, address(this));

   }
}

truffle script

`var assert = require('assert');
const path = require("path");
const fs = require("fs");


module.exports = async function(callback) {
  try {
     let arg1 = ""
     let arg2  = ""
     let  amount = '6'
     const accounts = await web3.eth.getAccounts();
     const acc2 = accounts[2];
     transferFuncName= "transferTo"
     const vic= artifacts.require("SC1");
     const att= artifacts.require("SC2");
     const vicobj = await vic.new();
     const attobj = await att.new();
     result1 = await web3.eth.sendTransaction({to:vicobj.address, from:acc2, value: web3.utils.toWei(‘11’)})

     arg2 =  attobj.address
     arg1 = web3.utils.toWei(amount,"ether")
     result2 = await vicobj[transferFuncName](arg1, arg2, {from:accounts[0]})
    }
 catch(error) {
    console.log(error)
  }

  callback()
}

Following is the error message:

Using network 'development'.
{ Error: Returned error: VM Exception while processing transaction: revert
at module.exports (/home/zulfi/Truffle_programs/js_search_opcode_js/executingFunc.js:23:46)
at process._tickCallback (internal/process/next_tick.js:68:7)
hijackedStack:
'Error: Returned error: VM Exception while processing transaction: revert\n at Object.ErrorResponse (/home/zulfi/.nvm/versions/node/v10.23.3/lib/node_modules/truffle/build/webpack:/node_modules/web3-core-helpers/src/errors.js:29:1)\n at /home/zulfi/.nvm/versions/node/v10.23.3/lib/node_modules/truffle/build/webpack:/node_modules/web3/node_modules/web3-core-requestmanager/src/index.js:170:1\n at /home/zulfi/.nvm/versions/node/v10.23.3/lib/node_modules/truffle/build/webpack:/packages/provider/wrapper.js:107:1\n

Somebody please guide me.

Zulfi.

Javascript: Searching a String containing parenthesis

zak100 — Tue, 27 Sep 2022 05:00:19 +0000

Hi,
I am using a string containing brackets as an argument to search. I am getting following error:
Using network 'development'.

SyntaxError: Invalid regular expression: /send(/: Unterminated group
at String.search ()
at module.exports (/home/zulfi/Truffle_programs/js_search_opcode_js/search_sendb.js:15:22)
at Object.exec (/home/zulfi/.nvm/versions/node/v10.23.3/lib/node_modules/truffle/build/webpack:/packages/require/require.js:127:1)
at Promise (internal/util.js:274:30)
at new Promise ()
at bound exec (internal/util.js:273:12)
at Object.run (/home/zulfi/.nvm/versions/node/v10.23.3/lib/node_modules/truffle/build/webpack:/packages/core/lib/commands/exec.js:80:1)
at process._tickCallback (internal/process/next_tick.js:68:7)
`

My code is:

`var assert = require('assert');
const path = require("path");
const fs = require("fs");

module.exports = async function(callback)
{
try{
   let keyWordStr1 = "address1.send(400)"
   let keyWordStr2 = "address2.transfer(500)"
   let commandS="send("
   let commandT="transfer("
   let sendStr = ""
   let transferStr = ""

   if(keyWordStr1.search(commandS) >= 0){
      sendStr = keyWordStr1
      console.log(sendStr)
   }
   if(keyWordStr2.search(commandT) >= 0){
      transferStr = keyWordStr[k]
      console.log(transferStr)
   }
}//try
catch (error) {
console.log(error)
}
callback();


}
`

Somebody please guide me.

Zulfi.