On Jan 24, 2015, at 5:25 PM, Maverick Peppers wrote:
> // Start of program4 process
> var fs = require('fs');
>
> // Asyncronously read and send the buffer object of a file whose path
> // is set int 2nd argument of the process to the callback function.
> var buffer = 0;
> fs.readFile(process.argv[2], fileReadCallBack);
>
> while(buffer == 0) {}
>
> var numOfNewLines = buffer.toString().split('\n').length-1;
> console.log(numOfNewLines);
>
> // Our callback function for our asyncronous file reading
> function fileReadCallBack(err, data) { if(!err){ buffer = data; } }
>
> I'm using NodeSchool.io's workshop to learn Nodejs. I'm on problem 4, Async
> File I/O and the above code runs forever. If the file reading is
> asynchronous, I'm thinking var buffer should no longer be 0 and the
> while-loop will terminate and move on.
>
> I know the correct solution would place the logic inside of the callback
> function, but I'm curious as to why the code above doesn't work as expected.
Because the line
> while(buffer == 0) {}
blocks the event loop.
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