iteragain/dist/esm/spy.js

Javascript Iterable/Iterator/Generator-function utilities.

import concat from './concat';
import take from './take';
import toIterator from './toIterator';
export function spy(...args) {
    if (!args.length || typeof args[0] === 'number')
        return it => spy(it, args[0]);
    const it = toIterator(args[0]);
    const next = take(it, args[1]);
    return [next, concat(next, it)];
}
export default spy;
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