iteragain/dist/esm/internal/FlatMapIterator.js

Javascript Iterable/Iterator/Generator-function utilities.

import toIterator from '../toIterator';
import isIterable from '../isIterable';
import isIterator from '../isIterator';
/** Maps and flattens an iterator by a depth of 1. String values returned from `iteratee` are not split into characters. */
export class FlatMapIterator {
    constructor(iterator, iteratee) {
        this.iterator = iterator;
        this.iteratee = iteratee;
        this.inner = null;
    }
    [Symbol.iterator]() {
        return this;
    }
    next(...args) {
        if (this.inner) {
            const next = this.inner.next(...args);
            if (next.done) {
                this.inner = null;
                return this.next(...args);
            }
            return next;
        }
        const next = this.iterator.next(...args);
        if (next.done)
            return next;
        const value = this.iteratee(next.value);
        if (typeof value !== 'string') {
            if (isIterator(value)) {
                this.inner = value;
                return this.next(...args);
            }
            else if (isIterable(value)) {
                this.inner = toIterator(value);
                return this.next(...args);
            }
        }
        return { value, done: false };
    }
}
export default FlatMapIterator;
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