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Module

x/better_iterators/mod.ts>Lazy#peekable

Chainable iterators (sync and async) for TypeScript, with support for opt-in, bounded parallelism
NfNitLoop/better-iterators
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method Lazy.prototype.peekable
import { Lazy } from "https://deno.land/x/better_iterators@v1.3.0/mod.ts";

Get a "peekable" iterator, which lets you peek() at the next item without removing it from the iterator.