Sub set of list using Java Script

I am trying to create a sub set of the list from a given list.

For example, I have a list of fields which can be checked and unchecked. I am trying to create a sub list which will only have those items which are checked.

I am unable to create it using Javascript as I am very new to the language.

this.attributeCategoryOptions.forEach((el) => {
    el.description += ' Required';
});

if (this.args.formData.descriptionDefaultFieldId) {
    this.descriptionDefaultFieldSelected = this.descriptionDefaultFieldOptions.find(
        (el) => this.args.formData.descriptionDefaultFieldId === el.id
    );
}

if (this.args.formData.iconUrl) {
    this.iconUrlSelected = this.iconUrlOptions.find(
        (el) => this.args.formData.iconUrl === el.id
    );
}


if (this.args.formData.attributeDescriptionIdOptions != null) {
    this.attributeCategoryOptions.forEach((listItem) => {
        listItem.checked = false;

        this.args.formData.attributeDescriptionIdOptions.forEach((attr) => {
            if (listItem.id === attr.id) {
                listItem.checked = attr.checked;
            }
        });
    });
}