iteragain/dist/es5/spy.js

Javascript Iterable/Iterator/Generator-function utilities.

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