Count the entries of a menu

I don’t know if it’s the best solution, but that’s how I did it:

helpers.js

let themeHelpers = {
    // Counts all elements of an array
    countArray: function(arrayContent) {
        if (arrayContent.constructor === Array) {
            return arrayContent.length;
        } else {
            return 0;
        }
    }
};
module.exports = themeHelpers;

in the template:

{{#checkIf (countArray menus.mainMenu.items) '==' 4}}
show something...
{{/checkIf}}

Works for me…