Object Utilities

Functions for working with object keys, values, and props.

collectProps

collectProps(object, collector, collection = {}) => collection

Helps to fill the collection with data from the provided object. The process is manual, and done by the collector function getting key and value a time.

Collect has an advantage over reduce in cases where you mutate the initial value, so you don't have to return anything (shorted and cleaner code).

const user = {    id: 123,    firstName: "Sam",    lastName: "Bridges",};
// By default collets into a new object:const userData = collectProps(    user,    (col, key, value) => (col[key] = key === "id" ? hash(value) : value));
// {id: "202cb9", firstName: "Sam", lastName: "Bridges"}
// But you can pass some specific collection instead:const userMap = collectProps(    user,    (map, key, value) => map.set(key, String(value)),    new Map());
// Map {"id" => "123", "firstName" => "Sam", "lastName" => "Bridges"}

filterProps

filterProps(object, predicate) => object

Creates a new object based on the provided object with properties copied over, but filtered by the mapper function.

const user = {    id: 123,    firstName: "Sam",    lastName: "Bridges",};
const userData = filterProps(user, key => key !== "id");
// {firstName: "Sam", lastName: "Bridges"}

mapKeys

mapKeys(object, mapper) => object

Creates a new object based on the provided object with its keys passed through the mapper function and values copied over.

const user = {    id: 123,    firstName: "Sam",    lastName: "Bridges",};
const userData = mapKeys(user, key => `_${key}`);
// {_id: 123, _firstName: "Sam", _lastName: "Bridges"}

mapValues

mapValues(object, mapper) => object

Creates a new object based on the provided object with its keys copied over and values passed through the mapper function.

const user = {    id: 123,    firstName: "Sam",    lastName: "Bridges",};
const userData = mapValues(user, (key, value) => value + 1);
// {id: 124, firstName: "Sam1", lastName: "Bridges1"}

reduceProps

reduceProps(object, reducer, initialValue) => ReducerReturnValue

Helps to reduce provided object into some value by passing its keys and values through the the reducer.

const user = {    id: 123,    firstName: "Sam",    lastName: "Bridges",};
const userData = reduceProps(user, (acc, key, value) => acc + key + value, "");
// "id123firstNameSamlastNameBridges"