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// codewars link=https://www.codewars.com/kata/vector-class

var Vector = function(components) {
    this.values = components;
    this.result=components;
    return this;
};
Vector.prototype.equals=function(){
  return this.result;
  }
Vector.prototype.add = function(vector) {
    var hisvalues = vector.values,
        myvalues = this.values,
        result;
    if (myvalues.length !== hisvalues.length) {
        throw ('Error');
    }

    result = myvalues.map(function(e, i) {
        return e + hisvalues[i];
    });
    this.values = result;
    this.result=result;
    return this;
}
Vector.prototype.subtract = function(vector) {
    var hisvalues = vector.values,
        myvalues = this.values,
        result;
    if (myvalues.length !== hisvalues.length) {
        throw ('Error');
    }
    result = myvalues.map(function(e, i) {
        return e - hisvalues[i];
    });
    this.values=result;
    this.result=result;
    return this;
}
Vector.prototype.dot = function(vector) {
    var hisvalues = vector.values,
        myvalues = this.values,
        result;
    if (myvalues.length !== hisvalues.length) {
        throw ('Error');
    }
    result = myvalues.map(function(e, i) {
        return e * hisvalues[i];
    });
    this.result=eval(result.join('+'));
   return this.equals();
}

Vector.prototype.norm=function(){
  var myvalues=this.values;
  var result=myvalues.map(function(e,i,a){
    return Math.pow(e,2);
  });
  this.result=Math.sqrt(eval(result.join('+')));
  return this.equals();
}

Vector.prototype.toString=function(){
  return '('+this.values.join(',')+')';
}