Angular, TypeError: Cannot read property 'toLowerCase' of undefined

Question

i\'m trying to make a custom filter pipe by following this link, but i got error that said Angular, TypeError: Cannot read property \'toLowerCase\' of undefined

Answer 1

try like this :

transform(items: any, term: any): any {
    if (term === undefined) return items;

    return items.filter(function(Product) {
        return Product.prdName.toLowerCase().includes(term.toLowerCase());
    })
}