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Buffer.alloc(8) // allocate 8 00bytes
Buffer.allocUnsafe(100) // allocate buffer with trash data
Buffer.allocUnsafe(100).fill() // fill allocated data
================
var str = "☕";
console.log(str.length);
console.log(Buffer.from(str).length);
================
const fs = require('fs');

const conversionMap = {
    '88': '65',
    '89': '66',
    '90': '67'
};

fs.readFile(__filename,(err,buffer)=>{
    let tag = buffer.slice(-3);
    console.log(tag);
    for(let i=0;i<tag.length;i++){
        tag[i] = conversionMap[tag[i]];
    }

    console.log(buffer.toString());
});

// TAG: XYZ