JavaScript promises, mastering the asynchronous

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What are 2 native functions to run code asynchronously in JavaScript ?
let fs = require('fs');

console.log('1');

fs.readFile('test.txt', 'utf8', function(error, data) {
    if (error) {
         throw error;
    }

    console.log('2');
});

console.log('3');
What is the output of the code above?
What is the function to stop an interval timer?
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