SVG.utils = {
  // Map function
  map: function (array, block) {
    var i
    var il = array.length
    var result = []

    for (i = 0; i < il; i++) {
      result.push(block(array[i]))
    }

    return result
  },

  // Filter function
  filter: function (array, block) {
    var i
    var il = array.length
    var result = []

    for (i = 0; i < il; i++) {
      if (block(array[i])) { result.push(array[i]) }
    }

    return result
  },

  // Degrees to radians
  radians: function (d) {
    return d % 360 * Math.PI / 180
  },

  // Radians to degrees
  degrees: function (r) {
    return r * 180 / Math.PI % 360
  },

  filterSVGElements: function (nodes) {
    return this.filter(nodes, function (el) { return el instanceof window.SVGElement })
  }

}