How can the values of an array be adjusted?

Currently I am working on an inventory script to display the player's inventory using an array. I am having trouble setting a .amount property as I am encountering undefined errors when attempting to set them. Unfortunately, I am unable to utilize sets or hashmaps in this scenario. Can anyone provide some insight into what could be causing this issue?

For debugging purposes, I am presently using NaN.

    //The array is already defined as 'inv'.//
    var inv = state.history[0].variables.player.inventory;
    inv[i].amount = 0;

    //Loop through every item in the inventory.//
    for (var i = 0; i < inv.length; i++) {

        //If the inventory item is Apple, it should refer to ...inventory.Apple.amount.//
        var q = inv[i].amount;

        //If we encounter a duplicate in the array, increment the count and continue.//
        if (inv[i] == inv[i-1]){
            q = (q + 1);

        //For the last or unique item, display it on the inventory screen.//
        } else {
            q = (q + 1);
            alert(inv[i] + " " + q.NaN);
            new Wikifier(place, inv[i] + " " + q.NaN + "<br>");
        }
    }

Answer №1

To avoid referencing i before it is defined in the loop, it is recommended to place it after:

//Shortcut: 'inv' is already defined as an array.//
var inv = state.history[0].variables.player.inventory;

//Iterate through each item in the inventory.//
for (var i = 0; i < inv.length; i++) {
    inv[i].amount = 0;

    //If the inventory item is an Apple, the quantity should be ...inventory.Apple.amount.//
    var q = inv[i].amount;

    //If a duplicate item is found in the array, increment the count and continue.//
    if (inv[i] == inv[i-1]){
        q = (q + 1);

    //If the item is the last one or unique, display it on the inventory screen.//
    } else {
        q = (q + 1);
        alert(inv[i] + " " + q.NaN);
        new Wikifier(place, inv[i] + " " + q.NaN + "<br>");
    }
}

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