I have an array of numbers, which I would like to write to a file using Node.JS.
If I have a number: 256
The file should contain the binary:
`00000010 00000101 00000110`
Buffer class can handle arrays of numbers directly:
// Old style var buffer = new Buffer([ 150 ]); // New style var buffer = Buffer.from([ 150 ]); // Write the buffer to a file. // Using `fs.writeFileSync()` just as an example here. require('fs').writeFileSync('output.bin', buffer);
If you're dealing with larger numbers (not bytes), you need to use a typed array.
For instance, using 16-bit unsigned values:
var array = [ 5000, 4000 ]; var u16array = Uint16Array.from(array); var buffer = new Buffer(u16array.buffer); require('fs').writeFileSync('output.bin', buffer);