blob: 2bd78a0a01e74433ae18eb551f954dbcc5831d4d [file] [log] [blame]
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// @assertion Iterable expand(Iterable f(E element))
/// Expands each element of this Iterable into zero or more elements.
/// The resulting Iterable runs through the elements returned by f for each
/// element of this, in iteration order.
/// The returned Iterable is lazy, and calls f for each element of this every
/// time it's iterated.
/// @description Checks that the length of resulting Iterable equals the total
/// number of inserted values
/// @author kaigorodov
library expand_A01_t02;
import "../../../Utils/expect.dart";
void check(Iterable a) {
int count = 0;
Iterable expanded = a.expand((element) {
List res = new List.empty(growable: true);
for (int k = 0; k < element; k++) {
return res;
int expanded_length = expanded.length; // force lazy evaluation
Expect.equals(count, expanded_length);
test(Iterable create([Iterable content])) {
check(create([1, 2]));
check(create([1, 2, 2]));
check(create([1, 2, 2, 3]));