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@std/collections@0.215.0

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It is unknown whether this package works with Browsers
It is unknown whether this package works with Deno
It is unknown whether this package works with Node.js
It is unknown whether this package works with Cloudflare Workers
It is unknown whether this package works with Bun
•JSR Score70%•
Downloads1/wk
•
Published2 years ago (0.215.0)
function findSingle
findSingle<T>(
array: Iterable<T>,
predicate: (el: T) => boolean
): T | undefined

Returns an element if and only if that element is the only one matching the given condition. Returns undefined otherwise.

Examples

Example 1

import { findSingle } from "@std/collections/find_single";
import { assertEquals } from "@std/assert/assert_equals";

const bookings = [
  { month: "January", active: false },
  { month: "March", active: false },
  { month: "June", active: true },
];
const activeBooking = findSingle(bookings, (it) => it.active);
const inactiveBooking = findSingle(bookings, (it) => !it.active);

assertEquals(activeBooking, { month: "June", active: true });
assertEquals(inactiveBooking, undefined); // there are two applicable items

Type Parameters

T

Parameters

array: Iterable<T>
predicate: (el: T) => boolean

Return Type

T | undefined

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Add Package

deno add jsr:@std/collections

Import symbol

import { findSingle } from "@std/collections/find_single";
or

Import directly with a jsr specifier

import { findSingle } from "jsr:@std/collections/find_single";