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 // 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. // Dart test program for testing function type parameters. // @dart = 2.9 import "package:expect/expect.dart"; class Param2Test { static forEach(List a, int f(int k)) { for (int i = 0; i < a.length; i++) { a[i] = f(a[i]); } } static int apply(f(int k), int arg) { var res = f(arg); return res; } static exists(List a, f(e)) { for (int i = 0; i < a.length; i++) { if (f(a[i])) return true; } return false; } static testMain() { int square(int x) { return x * x; } Expect.equals(4, apply(square, 2)); Expect.equals(100, apply(square, 10)); var v = [1, 2, 3, 4, 5, 6]; forEach(v, square); Expect.equals(1, v[0]); Expect.equals(4, v[1]); Expect.equals(9, v[2]); Expect.equals(16, v[3]); Expect.equals(25, v[4]); Expect.equals(36, v[5]); isOdd(element) { return element % 2 == 1; } Expect.equals(true, exists([3, 5, 7, 11, 13], isOdd)); Expect.equals(false, exists([2, 4, 10], isOdd)); Expect.equals(false, exists([], isOdd)); v = [4, 5, 7]; Expect.equals(true, exists(v, (e) => e % 2 == 1)); Expect.equals(false, exists(v, (e) => e == 6)); var isZero = (e) => e == 0; Expect.equals(false, exists(v, isZero)); } } main() { Param2Test.testMain(); }