Ways to accurately determine the size of an array

My issue revolves around an array of objects. When I log the array, everything appears as expected. However, when I use the .length function, it inexplicably returns a value of 0.

Check out my code snippet:

async fetchTicketType(updatedTicket) {
    await this.retrieveTicketTypes();
    if (this.ticketOptions) {
        console.log('I reached this point');
        console.log(this.ticketOptions);
        console.log(this.ticketOptions.length);
        for (let i = 0; i < this.ticketOptions.length; i++) {
            console.log('I reached this point');
            if (this.ticketOptions[i]["value"] === updatedTicket) {
                this.selectedTicketOption = this.ticketOptions[i];
            }
        }
    }
}

Here's a snapshot of the logs:

Answer №1

The reason for this issue is due to the presence of 10 undefined values in your array, causing it to lack a proper length property. By ensuring that each element contains a value, you can successfully retrieve the array. This behavior is a characteristic of JavaScript and how the length property is calculated for arrays.

Answer №2

If you want to convert it back into an array, you can follow these steps:

// arr is a new array containing 10 items
var arr = JSON.parse(JSON.stringify(this.optionsList));

After that, you can proceed with your loop...

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