Lodash Example of Building a Generic Filter

example.js

const _ = require("lodash");

const items = [
        {id:1, name: "fluffy", animal: "cat"},
        {id: 2, name: "spot", animal: "dog"},
        {id: 3, name: "clifford", animal: "dog"},
        {id: 4, name: "tony", animal: "tiger"}
    ];

const isAnimal = (animal, item) => item.animal === animal;
const hasName = (name, item) => item.name === name

// Curry allows us to have a function where we can specify the arguments separately before invoking the functions
const curriedIsAnimal = _.curry(isAnimal);
const curriedHasName = _.curry(hasName);

// Pretend this logic got the text from your user
const animalSelection = "dog";
const nameSelection = "clifford";

// Let's define our filters! The more searchboxes we can filter on, this list would be updated
const variousFilters = [
    curriedIsAnimal(animalSelection), // note that by specifying the first argument here, this function now has a signature of (item=>bool)
    curriedHasName(nameSelection), // same for this one!
];

// Once we have all of these filters defined, we can compose them with the && operator 
const finalFilter = variousFilters.reduce((a,b) => a&&b, true);

const itemsThatMatch = items.filter(finalFilter);
console.log(itemsThatMatch);