Lambda Function to list all lambda functions. Using marker to page the results

LambdaListFunction.js

const AWS = require('aws-sdk')
const lam = new AWS.Lambda()

async function getLambdaFuntions(marker)
{
  let promise = new Promise(function(resolve, reject) {
      var records = [];
      var result = {"records":records,"marker":marker}
      var params = {MaxItems: 100, FunctionVersion: 'ALL'}
      
      if(marker != null)
        params.Marker = marker
        
      lam.listFunctions(params, function(err, data) {
        if(err)
            reject(err)
  
        data.Functions.forEach(element => result.records.push(element.FunctionName))
        result.marker = data.NextMarker      
        resolve(result)
      })
       
    });
    
    return promise
 
}


exports.handler = async (event, context) => {

    var records = []
    var marker = null
    
    while(true)
    {
        result = await getLambdaFuntions(marker)        
        marker = result.marker
        result.records.forEach(record => records.push(record))        
        if(result.marker == null)
          break
    }
    
    console.log(records)
};