Asynchronous Priority Task Scheduler

[somber igloo]

Hi guys, today I was giving exam for one company, it was on imocha, JS round in they asked a question on Asynchronous Priority Task Scheduler (async/await), I tried my 2/3 approach but that doesn't work, for your reference I am attaching the question and my approach, it would be very helpful if someone help me on that to know where I was wrong in my approach

[minor thunder]

@somber igloo Looking at the code you shared, it seems the problem stems from await task.taskFunction(). Could you explain why you're using it there?

[somber igloo]

This line executes the asynchronous function (taskFunction) associated with the current task, and waits for it to complete before proceeding to the next task.

[deep gust]

what's not working? what's the output of this code anyway?

[somber igloo]

It worked, this is the working code

class PriorityTaskScheduler {
 constructor() {
   this.tasks = [];
 }

 addTask(taskFunction, delay, priority) {
   this.tasks.push({ taskFunction, delay, priority });
 }

 async executeTasks() {

   this.tasks.sort((a, b) => {
     if (a.priority !== b.priority) {
       return a.priority - b.priority;
     } else {
       return a.delay - b.delay;
     }
   });

   for (const task of this.tasks) {
     await new Promise((resolve) => setTimeout(resolve, task.delay));
     await task.taskFunction();
   }

   this.tasks = [];
 }
}

// Main handler
(async () => {
 const readline = require('readline');

 const rl = readline.createInterface({
   input: process.stdin,
   output: process.stdout,
   terminal: false,
 });

 const scheduler = new PriorityTaskScheduler();
 let inputLines = [];
 let lineCount = 0;
 let numCommands = 0;

 rl.on('line', async (line) => {
   if (lineCount === 0) {
     numCommands = parseInt(line);
   } else {
     inputLines.push(line);
   }
   lineCount++;

   if (inputLines.length === numCommands) {
     for (let cmd of inputLines) {
       if (cmd.startsWith('addTask')) {
         let [, delayStr, priorityStr] = cmd.split(' ');
         let delay = parseInt(delayStr);
         let priority = parseInt(priorityStr);

         const task = async () => {
           console.log(`${delay} ${priority}`);
         };

         scheduler.addTask(task, delay, priority);
       } else if (cmd === 'executeTasks') {
         await scheduler.executeTasks();
       }
     }
     rl.close();
   }
 });
})();

[deep gust]

ah yes, i guess you didn't call the main function

i'm guessing you're new to js? or you didn't use it in a while