Array base vector with method - Node.js Data Structure

Node.js examples for Data Structure:Vector

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Description

Array base vector with method

Demo Code

(function() {/*from w w  w.j a  v  a 2s  .  c om*/

   
   Array.prototype.plus = function(other) {
      var result = [];
      var len = this.length;
      for(var i = 0; i < len; i++) {
   result[i] = this[i] + other[i];
      }
      return result;
   };
   
   Array.prototype.minus = function(other) {
      var len = this.length;
      var result = [];
      for(var i = 0; i < len; i++) {
   result[i] = this[i] - other[i];
      }
      return result;
   };
   
   Array.prototype.scale = function(num) {
      var len = this.length;
      var result = [];
      for(var i = 0; i < len; i++) {
   result[i] = this[i]*num;
      }
      return result;
   };
   
   Array.prototype.scaleto = function(newlength) {
      var len = this.veclength();
      if (len == 0) {
   return [0,0];
      }
      return this.scale(newlength/len);
   };
   
   Array.prototype.veclength = function() {
      var len = this.length;
      var sum = 0;
      var element;
      for(var i = 0; i < len; i++) {
   element = this[i];
   sum += (element * element);
      }
      return Math.sqrt(sum);
   };
   
   Array.prototype.x = function() {
      return this[0];
   };
   
   Array.prototype.y = function() {
      return this[1];
   };
   
})();

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