javascript - Get and set in js using function constructors -

this code

function choices(questions, options, yourchoices) {    this.questions = questions;    this.options = options;    this.yourchoices = yourchoices;  };    choices.prototype.displaychoices = function() {    console.log(this.questions)    (var = 0; < this.options.length; i++) {      console.log(i + ':' + this.options[i]);    }  }    choices.prototype.getchoices = function(opt) {    if (opt == this.yourchoices) {      console.log('wow,' + this.options + ' favaroite!');    } else {      console.log('choose wisely')    }  }    var c1 = new choices('which food?', ['paneer', 'mutton', 'chicken'], ['1', '2', '3'])    var c2 = new choices('which color?', ['orange', 'red', 'blue'], ['1', '2', '3'])    var choices = [c1, c2];  var n = math.floor(math.random() * choices.length);  choices[n].displaychoices();  var getchoice = parseint(prompt('please select of options..'));  choices[n].getchoices(getchoice);

well tried choose wisely , condition in if statement false... should please help!! thank you:)

the problem due line:

if(opt == this.yourchoices) 

this.yourchoices array cant equal single number i-e opt. remove condition , code work. if user enter wrong number this.options[opt] undefined. hence make check. if(this.options[opt]) check whether undefined or not.

function choices(questions,options,yourchoices) {      this.questions = questions;      this.options = options;      this.yourchoices = yourchoices;    };  choices.prototype.displaychoices = function(){      console.log(this.questions)      for(var = 0; < this.options.length; i++){          console.log(i +':'+ this.options[i]);      }  }  choices.prototype.getchoices = function(opt){  				if(this.options[opt]){          console.log('wow,'+this.options[opt]+' favaroite!');          }else{          console.log("choose wisely");          }                }    var c1 = new choices('which food?',                      ['paneer','mutton','chicken'],                      ['1','2','3']                      )    var c2 = new choices('which color?',                      ['orange','red','blue'],                      ['1','2','3']                      )     var choices = [c1, c2];  var n = math.floor(math.random() * choices.length);  choices[n].displaychoices();  var getchoice = parseint(prompt('please select of options..'));    choices[n].getchoices(getchoice);