Discussing the importance of setting up variables in an Angular Factory

I am trying to develop a factory that will generate a PlayerList, but I am encountering issues with accessing the variables I have defined in the initialize function. Below is the code snippet:

app.factory("PlayerList", function(){

    // Define the PlayerList function
    var PlayerList = function() {

        this.initialize = function() {
            // create an array for our players
            var players = [];
        };

        this.add = function(player) {
            this.players.push(player);
        }

        this.remove = function(player) {
            if ( players.length > 0 )
            {
                this.players.splice(players.indexOf(player), 1);    
            }
        }

        this.initialize();
    };

    return (PlayerList);

});

I am aiming to access the players array within the add and remove methods, however, I keep receiving undefined as the output.

Answer №1

In this code snippet, the variable players = []; is a local variable for the function initialize, but you are expecting this.players.push(player); to work, which means that players should be in the scope of PlayerList.

Therefore, your factory function should look like this:

app.factory("PlayerList", function () {

    var PlayerList = function () {
        var self = this;

        this.players = [];

        this.initialize = function () {
            self.players = [];
        };

        this.add = function (player) {
            self.players.push(player);
            console.log(self.players);
        }

        this.remove = function (player) {
            if (self.players.length > 0) {
                self.players.splice(self.players.indexOf(player), 1);
            }
        }

        this.initialize();
    };

    return (PlayerList);
});

Answer №2

let list = (function(){

let lists = {};

list.playerList = function() {

    this.initiate = function() {
        // create an array to store players
        let players = [];
    };

    this.add = function(player) {
        this.players.push(player);
    }

    this.remove = function(player) {
        if (players.length > 0)
        {
            this.players.splice(players.indexOf(player), 1);    
        }
    }

    this.initiate();
};

return lists;

})();

app.factory("PlayerList", list.playerList);

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