Lazy Evaluation in javascript by memoized version of call-by-name method

lazy-evaluation.js

// EAGER EVALUATION with RangeError on the var stream

function Stream(value) {
  this.value = value;
  this.next = new Stream(value + 1);
}

var stream = new Stream(10);
console.log(stream);


// LAZY EVALUATION

function Stream(value) {
  this.value = value;
  
  Object.defineProperty(this, "next", {
    get : function() {
      return new Stream(this.value + 1);
    } 
  });
}

Stream.prototype.takeUntil = function(n, accumulator) {
  accumulator = accumulator || [];
  
  if (n < this.value) {
    return;
  }
  
  if (n === this.value) {
    return accumulator;
  }
  
  accumulator.push(this.value);
  return this.next.takeUntil(n, accumulator);
}

var stream = new Stream(10);
console.log(stream.takeUntil(20));