Robert Nystrom
5c1376615e
Change-Id: I369916a9edd3a9b38ab2c9ee1e11c4735331142b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/150284 Auto-Submit: Bob Nystrom <rnystrom@google.com> Commit-Queue: Lasse R.H. Nielsen <lrn@google.com> Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
64 lines
1.5 KiB
Dart
64 lines
1.5 KiB
Dart
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Dart test program for testing function type parameters.
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import "package:expect/expect.dart";
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class Param2Test {
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static forEach(List<int> a, int f(int k)) {
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for (int i = 0; i < a.length; i++) {
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a[i] = f(a[i]);
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}
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}
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static int apply(f(int k), int arg) {
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var res = f(arg);
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return res;
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}
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static exists(List<int> a, f(e)) {
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for (int i = 0; i < a.length; i++) {
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if (f(a[i])) return true;
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}
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return false;
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}
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static testMain() {
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int square(int x) {
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return x * x;
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}
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Expect.equals(4, apply(square, 2));
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Expect.equals(100, apply(square, 10));
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var v = [1, 2, 3, 4, 5, 6];
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forEach(v, square);
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Expect.equals(1, v[0]);
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Expect.equals(4, v[1]);
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Expect.equals(9, v[2]);
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Expect.equals(16, v[3]);
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Expect.equals(25, v[4]);
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Expect.equals(36, v[5]);
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isOdd(element) {
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return element % 2 == 1;
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}
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Expect.equals(true, exists([3, 5, 7, 11, 13], isOdd));
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Expect.equals(false, exists([2, 4, 10], isOdd));
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Expect.equals(false, exists([], isOdd));
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v = [4, 5, 7];
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Expect.equals(true, exists(v, (e) => e % 2 == 1));
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Expect.equals(false, exists(v, (e) => e == 6));
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var isZero = (e) => e == 0;
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Expect.equals(false, exists(v, isZero));
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}
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}
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main() {
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Param2Test.testMain();
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}
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