rudimentary non-blocking computation example

non-blocking-computation.js

// 18 Oct 2016
// non-blocking computation

function operate(list, match, callback) {
  var start = +new Date()
  setTimeout(function next() {

    if (list.length == 0) {
      callback('done')
      callback((+new Date() - start) + 'ms')

      return 
    }
    
    var item = list.pop()
    
    if (item == match) {
      
      callback(item)
      list = []
    }
    
    setTimeout(next, 0)
  }, 0)
  
}

var array = (function(){
  var arr = [], i = 0
  while (i < 1000) {
    arr.push(i++)
  }
  return arr
}());

operate(array, 100, function(value) {
  console.log(value);
});

/*
 100
 done
 4894ms
 */