Find the needle in the haystack

idxOf.js

let _idxOf = function(needle){
    return function(haystack){
        return haystack.toLowerCase().indexOf(needle.toLowerCase()) !== -1;
    };
};

// e.g
let searchTerm = "fly";
let pets = [{ name: 'George', type: 'fly' }, { name: 'Benson', type: 'dog' }];

let filtered = pets.filter(function(item){
    let f = _idxOf(searchTerm);
    return f(item.name) || f(item.type);
});
 
console.log(filtered);