Function iteratorFor

packages/core/fetch/index.mjs:65–80

(items)

    // Build a destructive iterator for the value list
    function iteratorFor(items) {
        var iterator = {
            next: function () {
                var value = items.shift();
                return { done: value === undefined, value: value };
            }
        };

        if (support.iterable) {
            iterator[Symbol.iterator] = function () {
                return iterator;
            };
        }

        return iterator;
    }

    function Headers(headers) {
        this.map = {};