Array overwritten (Javascript) -

i'm working on spa let search through movie titles , scenarists names (an studies project). well, got stuck on weird problem. unfortunately when try connect 2 tables (scenarists , movies) 1 (so can many-many connections) new array gets create overwritten last created object. can't find problem, i'll glad if can help. problem somewhere between push methond , respond.json(movie).

var express = require('express'); var bodyparser = require('body-parser'); var port = +process.argv[2];  var app = express(); app.use(bodyparser.urlencoded({extended: true})); app.use(bodyparser.json());  var movieid = 11; //first free movie's id var scenaristid = 15; // first free scenarist's id var scenarists = [ { id: 1, name: "glenn ficarra"},               { id: 2, name: "john requa"},               { id: 3, name: "jakub kos"},               { id: 4, name: "david kos"},               { id: 5, name: "jonathan nolan"},               { id: 6, name: "christopher nolan"},               { id: 7, name: "jeb stuart"},               { id: 8, name: "steven e. de souza"},               { id: 9, name: "doug richardson"},               { id: 10, name: "jason hall"},               { id: 11, name: "noah oppenheim"},               { id: 12, name: "t.s nowlin"},               { id: 13, name: "luc besson"},               { id: 14, name: "michael allin"}];  var movies = [ { id: 1, title: "focus", scenarist1: 1, scenarist2: 2},           { id: 2, title: "test drive", scenarist1: 3, scenarist2: 4},           { id: 3, title: "interstellar", scenarist1: 5, scenarist2: 6},           { id: 4, title: "die hard", scenarist1: 7, scenarist2: 8},           { id: 5, title: "die hard 2", scenarist1: 8, scenarist2: 9},           { id: 6, title: "the dark knight rises", scenarist1: 5, scenarist2: 6},           { id: 7, title: "american sniper", scenarist1: 10, scenarist2: -1},           { id: 8, title: "the maze runner", scenarist1: 11, scenarist2: 12},           { id: 9, title: "taxi", scenarist1: 13, scenarist2: -1},           { id: 10, title: "enter dragon", scenarist1: 14, scenarist2: -1}];  moviecollection = new array();  //get - pobranie kolekcji app.get('/movies', function (request, respond) {     var i, scen1, scen2, scenarists, movie, movie2;     console.log('reading movies');     movie = { title: undefined,              scenarist1: undefined,              scenarist2: undefined,              id: undefined             };      (i = 0; < movies.length; i++) {         scen1 = movies[i].scenarist1;         scen2 = movies[i].scenarist2;         scenarists = connectscenarist(scen1, scen2);         console.log('scenarists ' + + ' = ' + scenarists.scenarist1 + ', ' + scenarists.scenarist2);         movie.scenarist1 = scenarists.scenarist1;         movie.scenarist2 = scenarists.scenarist2;         movie.id = movies[i].id;         movie.title = movies[i].title;         moviecollection.push(movie);         //console.log(moviecollection[i].scenarist1);         //console.log(json.stringify(moviecollection));     }     //console.log(json.stringify(moviecollection));     console.log(moviecollection[2].scenarist1);     respond.json(moviecollection); });  function connectscenarist(sce1, sce2) {     var i, counter, allscenarists;     counter = 0;     allscenarists = {         scenarist1: undefined,         scenarist2: undefined     };     if (sce1 === -1) {         allscenarists.scenarist1 = "-";         counter++;     }     if (sce2 === -1) {         allscenarists.scenarist2 = "-";         counter++;     }     if (counter < 2) {         (i = 0; < scenarists.length; i++) {             if (sce1 === scenarists[i].id) {                 allscenarists.scenarist1 = scenarists[i].name;                 counter++;             }             if (sce2 === scenarists[i].id) {                 allscenarists.scenarist2 = scenarists[i].name;                 counter++;             }             if (counter === 2) {                 break;             }         }     }     //console.log('saving movie: ' + json.stringify(allscenarists));     return allscenarists; } 

yes, there's single movie object in function. objects don't copied on assignment or on call in javascript. create new 1 on every iteration putting literal in body of loop!

also, there single moviecollection array in app shared requests. not want, getting results of other users.

var moviecollection = []; (var = 0; < movies.length; i++) {     var m = movies[i],         scenarists = connectscenarist(m.scenarist1, m.scenarist2);     moviecollection.push({         title: m.title,         scenarist1: scenarists.scenarist1,         scenarist2: scenarists.scenarist2,         id: m.id     });     console.log(moviecollection[i]); } console.log(json.stringify(moviecollection));