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last ​

Problem ​

You need the last element of an array safely, without accessing array[array.length - 1] and handling the empty-array case explicitly.

Solution ​

Use last(array, fallback?) to get the last element or a typed fallback.

ts
import { last } from '@vielzeug/arsenal';

last([10, 20, 30]); // 30
last([]); // undefined
last([], -1); // -1

Pitfalls ​

  • Without a fallback, the return type includes undefined. Provide a fallback to get a non-optional type.