make a float 32 array and save it to disk

node-array.coffee

fs = require 'fs'

toFloatArray = (list) ->
  buffer = new ArrayBuffer(4 * list.length)
  dataView = new DataView buffer
  offset = 0
  addNextValue = (value) ->
    dataView.setFloat32 offset, value, true
    offset += 4
  addNextValue val for val in list
  return new Buffer(buffer)

example = [-2.56, 999999999999999, 1.0001]


wstream = fs.createWriteStream 'myFile.bin' 
try
  wstream.write(toFloatArray example);
finally
  wstream.end();