import { type Entries } from "https://deno.land/x/scaffold@0.3.0/src/deps/types.ts";
Many collections have an entries method which returns an array of a given object's own enumerable string-keyed property [key, value] pairs. The Entries type will return the type of that collection's entries.
For example the Object, Map, Array, and Set collections all have this method. Note that WeakMap and WeakSet do not have this method since their entries are not enumerable.
Examples
Example 1
Example 1
import type {Entries} from 'type-fest';
interface Example {
someKey: number;
}
const manipulatesEntries = (examples: Entries<Example>) => examples.map(example => [
// Does some arbitrary processing on the key (with type information available)
example[0].toUpperCase(),
// Does some arbitrary processing on the value (with type information available)
example[1].toFixed()
]);
const example: Example = {someKey: 1};
const entries = Object.entries(example) as Entries<Example>;
const output = manipulatesEntries(entries);
// Objects
const objectExample = {a: 1};
const objectEntries: Entries<typeof objectExample> = [['a', 1]];
// Arrays
const arrayExample = ['a', 1];
const arrayEntries: Entries<typeof arrayExample> = [[0, 'a'], [1, 1]];
// Maps
const mapExample = new Map([['a', 1]]);
const mapEntries: Entries<typeof map> = [['a', 1]];
// Sets
const setExample = new Set(['a', 1]);
const setEntries: Entries<typeof setExample> = [['a', 'a'], [1, 1]];