How to Filter Emails in GMail and Read Email Body Using GAS?

 How to Filter Emails in GMail and Read Email Body Using GAS?

function getThreadSummariesV3(){

  const threads=GmailApp.getInboxThreads();//Reads first 500 emails only.

  //Logger.log(threads.length)

  let pValue=0;

  let myBody='';

  let mySubject='';

  let booSub='';

  //let recCount=0;

  const sh=SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Sheet3')

  threads.forEach(function(thread){

    //recCount+=1;

    const lRow=sh.getLastRow()+1;

    //if (recCount<100){

      const threadId=GmailApp.getThreadById(thread.getId());

      const threadMsgs=threadId.getMessages();

      threadMsgs.forEach(function(threadMsg){

        mySubject=threadMsg.getSubject();

        //Logger.log(mySubject);

        booSub=isPresent(mySubject);

        //Logger.log('booSub is '+booSub);

        if(threadMsg.getFrom()=='YouTube <noreply@youtube.com>'){

          //Logger.log(threadMsg.getPlainBody().length);

          Logger.log(booSub);

          if(booSub==true){ //if(booSub='true') here 'true' in bracket was not giving the result.

            if(threadMsg.getPlainBody().length>5000){

              return;

            }

            sh.getRange(lRow,1).setValue(threadMsg.getFrom());

            sh.getRange(lRow,2).setValue(threadMsg.getCc());

            sh.getRange(lRow,3).setValue(threadMsg.getDate());

            //Logger.log(threadMsg.getPlainBody());

            myBody=threadMsg.getPlainBody();

            pValue=myFind(myBody);

            //Logger.log(myBody);

            //Logger.log(pValue);

            //Logger.log(left(myBody,pValue))

            sh.getRange(lRow,4).setValue(left(myBody,pValue));

            sh.getRange(lRow,5).setValue(threadMsg.getId());

          }

        }

      })

    //}

  })

}

function myFind(abc){

  //const abc='Sujeet is my Name.'

  //Logger.log(abc);

  let placeValue=0;

  //Logger.log(abc.length)

  let i=0;

  for (let j=0; j<=abc.length-1;j+=1){

    //Logger.log(abc[j]);

    if(abc[j]==" "){

      i+=1;

    }

    if(i==2){

      placeValue=j;

      break;

    }

  }

  return placeValue

  //Logger.log(placeValue);

}

function isPresent(lmv){

  //const lmv='Avinash Jadhav has subscribed to you on YouTube!';

  const boo=lmv.includes('subscribed',1);

  //Logger.log(boo);

  return boo;

}

function right(str, chr) {

  return str.slice(str.length-chr,str.length);

}

 

function left(str, chr) {

  return str.slice(0, chr - str.length);

}