iteragain/dist/cjs/unique.js

Javascript Iterable/Iterator/Generator-function utilities.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.unique = unique;
const toIterator_1 = require("./toIterator");
const FilterIterator_1 = require("./internal/FilterIterator");
function unique(...args) {
    var _a;
    if (typeof args[0] === 'function' || !args.length)
        return it => unique(it, args[0]);
    const it = (0, toIterator_1.default)(args[0]);
    args[1] = (_a = args[1]) !== null && _a !== void 0 ? _a : ((v) => v);
    const { iteratee = (v) => v, justSeen = false } = typeof args[1] === 'function' ? { iteratee: args[1] } : args[1];
    if (justSeen) {
        let lastValue;
        let hasLastValue = false;
        return new FilterIterator_1.default(it, value => {
            value = iteratee(value);
            if (!hasLastValue || value !== lastValue) {
                lastValue = value;
                hasLastValue = true;
                return true;
            }
            return false;
        });
    }
    const seen = new Set();
    return new FilterIterator_1.default(it, value => {
        value = iteratee(value);
        if (!seen.has(value)) {
            seen.add(value);
            return true;
        }
        return false;
    });
}
exports.default = unique;
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