iteragain/dist/es5/unique.js

Javascript Iterable/Iterator/Generator-function utilities.

import toIterator from './toIterator';
import FilterIterator from './internal/FilterIterator';
export function unique() {
    var _a;
    var args = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        args[_i] = arguments[_i];
    }
    if (typeof args[0] === 'function' || !args.length)
        return function (it) { return unique(it, args[0]); };
    var it = toIterator(args[0]);
    args[1] = (_a = args[1]) !== null && _a !== void 0 ? _a : (function (v) { return v; });
    var _b = typeof args[1] === 'function' ? { iteratee: args[1] } : args[1], _c = _b.iteratee, iteratee = _c === void 0 ? function (v) { return v; } : _c, _d = _b.justSeen, justSeen = _d === void 0 ? false : _d;
    if (justSeen) {
        var lastValue_1;
        return new FilterIterator(it, function (value) {
            value = iteratee(value);
            if (!lastValue_1 || value !== lastValue_1) {
                lastValue_1 = value;
                return true;
            }
            return false;
        });
    }
    var seen = new Set();
    return new FilterIterator(it, function (value) {
        value = iteratee(value);
        if (!seen.has(value)) {
            seen.add(value);
            return true;
        }
        return false;
    });
}
export default unique;
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