batteries/lib/range.js

// batteries
// Copyright 2010 - 2011 Sami Samhuri <sami@samhuri.net>

exports.Range = Range;

exports.extendNative = function(context) {
  context.Range = Range;
};

function Range(start, length) {
  this.start = start;
  this.length = length;
};

Range.prototype.inRange = function(val) {
  if (this.test) return this.test(val);
  return val >= this.start && val <= this.start + this.length;
};

Range.prototype.toArray = function(nth) {
  var a = []
    , i = this.length
    ;
  nth = nth || this.nth;
  if (nth)
    while (i--) a[i] = nth(i);
  else
    while (i--) a[i] = this.start + i;
  return a;
};