Pick properties from an object
Build a new object with only the requested own properties.
function pick({ value, keys }) { return Object.fromEntries(keys.filter(key => Object.hasOwn(val…objectCollection · 13 utilities
Object utilities
Pick only the fields you need, understand shallow copies and keep prototype keys as data.
Omit properties from an object
Keep the own enumerable fields that are not in a supplied list.
function omit({ value, keys }) { return Object.fromEntries(Object.entries(value).filter(([key])…objectCreate an object from pairs of key and value
Turn [key, value] pairs into a plain object with Object.fromEntries.
function toObject(pairs) { return Object.fromEntries(pairs); }objectCheck if multiple objects are equal
Compare JSON serializations with the first object.
function areEqual(objects) { return objects.every(object => JSON.stringify(object) === JSON.str…objectGet the value at given path of an object
Follow a dot-separated path, stopping at a missing step.
function getValue({ path, object }) { return path.split('.').reduce((value, key) => (value == n…objectImmutably rename object keys
Return a copy with keys renamed through a mapping.
function renameKeys({ keysMap, object }) { return Object.fromEntries(Object.entries(object).map…objectInvert keys and values of an object
Swap every key with its value.
function invert(object) { return Object.fromEntries(Object.entries(object).map(([key, value]) =…objectExtract values of a property from an array of objects
Pluck one field from every record.
function pluck({ objects, property }) { return objects.map(object => object[property] ?? null);…objectSort an object by its properties
Rebuild an object with its keys in sorted order.
function sortKeys(object) { return Object.fromEntries(Object.keys(object).sort().map(key => [ke…objectRemove all null and undefined properties from an object
Drop keys whose value is null or undefined.
function removeNullish(object) { return Object.fromEntries(Object.entries(object).filter(([, va…objectShallow copy an object
Copy own enumerable properties into a new object.
function shallowCopy(object) { return { ...object }; }objectGet unique objects from an array by key
Keep one record per key value, the last one seen.
function uniqueBy({ objects, key }) { return [...new Map(objects.map(item => [item[key], item])…objectCreate an empty map that does not have properties
An object with no prototype: no inherited keys such as toString or __proto__.
function createDictionary() { return Object.create(null); }objectTry a function in the local code lab, then read its limits before using it in an application.