Function flatMapIterator

test/fixtures/snapshot/typescript.js:734–759

(iter, mapfn)

    }
    ts.flatMapToMutable = flatMapToMutable;
    function flatMapIterator(iter, mapfn) {
        var first = iter.next();
        if (first.done) {
            return ts.emptyIterator;
        }
        var currentIter = getIterator(first.value);
        return {
            next: function () {
                while (true) {
                    var currentRes = currentIter.next();
                    if (!currentRes.done) {
                        return currentRes;
                    }
                    var iterRes = iter.next();
                    if (iterRes.done) {
                        return iterRes;
                    }
                    currentIter = getIterator(iterRes.value);
                }
            },
        };
        function getIterator(x) {
            var res = mapfn(x);
            return res === undefined ? ts.emptyIterator : isArray(res) ? arrayIterator(res) : res;
        }
    }
    ts.flatMapIterator = flatMapIterator;
    function sameFlatMap(array, mapfn) {
        var result;