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 1)offset api pagniation 2)find smallest number from 3 arrays and do it paralley using promise or async 3)how to do 20 min  task with lambda 4)start pattern 5)lambda service and how many lambdas' 6)In serverless deploy we deploy to s3 bucket and  7)mongodb number of employes having 5000 salary with salary query 8)Employee table having id,name,manager Id  find out manager of each having managerID link with employee id query/ 9)If lambda is taking time how will you check 10)How to read a file from html to serveer, lambda os uses internally, and if you need to read a csv file and then check if id is present and write to db then should use await for promise.then. 11)Need to read a email and check if email has approved text and process it how to do/

 1)Types of aws sqs? ans: Amazon Simple Queue Service (SQS) offers two main types of queues: Standard Queues and FIFO (First-In-First-Out) Queues. Here's an overview of each: Standard Queues: Standard Queues offer best-effort ordering, which means that messages are generally delivered in the order they are sent, but occasionally, out-of-order delivery may occur. They provide high throughput, with the ability to process a large number of messages per second. Standard Queues offer at-least-once message delivery, which means that a message can be delivered more than once (but not skipped). They are suitable for use cases where strict message ordering is not required or where messages can be processed out of order without causing issues. FIFO (First-In-First-Out) Queues: FIFO Queues provide exactly-once message processing and ordered message delivery. Messages are delivered in the order they are sent, and each message is delivered exactly once. They are designed for applications that r...

1)[1,2]+[3,4] 2)var a=10; function b(){ console.log(a); var a=20 } b(); 3)Lambda size and how to use in s3 4)promise or next tick console setimeediate 5)profit problem 6)context vs event 7) NaN===NaN 8)layers in lambda 9)TTL in sqs, visibility timeout,default time 10)lambda size,defualt time 11)Can lambda trigger sns or viceversa 12)corre modules in nodejs

Introduction: MongoDB, a leading NoSQL database, offers unparalleled flexibility and scalability. However, achieving optimal query performance in MongoDB often relies on implementing effective indexing strategies. In this article, we'll delve into various indexing techniques and provide real-world examples to demonstrate their impact on query performance. Single Field Index: Single field indexes are ideal for accelerating queries that filter, sort, or search based on a specific field. Let's consider a scenario where we have a collection of user profiles, and we frequently query users by their username field: db.users.createIndex({ "username": 1 }) This index significantly speeds up queries like: db.users.find({ "username": "john_doe" }) Compound Index: Compound indexes are invaluable when queries involve multiple fields. Suppose we have a collection of products and often filter by both category and price: db.products.createIndex({ "category...

1) Advantages of TypeScript TypeScript offers several advantages over plain JavaScript: Static Typing: TypeScript introduces static typing, allowing developers to define types for variables, function parameters, and return values. This helps catch type-related errors during development and provides better code documentation. Enhanced Tooling: TypeScript provides improved tooling support, including features like code completion, refactoring, and navigation, which enhance developer productivity. Readability and Maintainability: With explicit type annotations, TypeScript code tends to be more readable and self-documenting. This makes it easier for developers to understand and maintain large codebases. Early Error Detection: TypeScript's type system catches many common errors at compile-time, such as type mismatches and missing properties, reducing the likelihood of runtime errors. Example: typescript Copy code // Plain JavaScript function greet(name) {     return 'Hello, ' + n...

  //Covered queries typeof typeof 1 cursor 3 larget number without sorting //How idexes are store internally string and number value //How to get 10 million data form mongodb without limit and skip //let s= "abcabcbb";//Output should be 3 abc // console.log('1')   // function demoFunction() { //  setTimeout(() => { //      console.log('2') //   }, 0) // }   // const promise = new Promise((resolve, reject) => { //  console.log('3') //  resolve('promise result') // })   // demoFunction()   // promise.then(() => { //  console.log('4') // })   // console.log('5'); //1 //3 //5 //4 //2 // Input: s = "abcabcbb" // Output: 3 function lengthOfLongestSubstring(s) { let maxLength = 0; let start = 0; const charIndexMap = new Map(); // Map to store the index of each character for (let end = 0; end < s.length; end++) { const char = s[end]; if (charIndexMap.has(char)) { ...