JavaScript Practice 11/21

Object + array combined search

Real data is usually an array of objects - a list of people, products, orders. Searching it means combining two things you already know: .filter() from Phase 4 to narrow the array, and property access from Phase 5 to look inside each object.

The one new piece is checking several properties at once. criteria is a plain object like { age: 30, city: "London" }, and you want to keep only the items that match every key in it. Object.keys(criteria) gives you that list of keys to check, and .every() returns true only if all of them match - exactly the "match everything" rule the task needs.

Your task: write findMatching(list, criteria), returning every object in the list array whose properties match ALL key/value pairs in the plain object criteria.

You'll practice:

Reading Object.keys() off a plain object
Combining .filter() and .every() to require every condition to match

// Write findMatching(list, criteria): return every object in the list array
// whose properties match ALL key/value pairs in criteria.
// e.g. findMatching(people, { age: 30 }) returns everyone aged 30.
function findMatching(list, criteria) {

}