How to moodify the List Choice Field options in SharePoint using the Javascript Client Object model

A sample JS to modify the list choice field options.

var context = new SP.ClientContext.get_current();
var web = context.get_web();
var cldList = web.get_lists().getByTitle("Calendar");
var categoryField = cldList.get_fields().getByInternalNameOrTitle("Category");
var categoryChoiceField = context.castTo(categoryField, SP.FieldChoice);
context.load(categoryChoiceField);
 
context.executeQueryAsync(function () {
        var categoryChoices = categoryChoiceField.get_choices();
        var categoryTC = categoryChoices.filter(function (choice) {
            return choice === "MyEvents";
        });
 
        if (categoryTC.length == 0)
        {
            categoryChoices.push("MyEvents");
 
            categoryChoiceField.set_choices(categoryChoices);
            categoryChoiceField.updateAndPushChanges();
            context.executeQueryAsync(function () { }, function () { });
        }
    }, function () { });

The above script includes the specified option into the list choice field, if it doesn’t exist.