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// Copyright (c) 2012, 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 = 2.9
import "package:expect/expect.dart";
/**
* Test various forms of function literals.
*/
typedef int IntFunc(int);
class FunctionLiteralsTest {
static void checkIntFunction<T>(expected, int f(T x), arg) {
Expect.equals(expected, f(arg));
}
static void checkIntFuncFunction<T>(expected, IntFunc f(T x), arg) {
Expect.equals(expected, f(arg)(arg));
}
int func1(int x) => x;
int func2(x) => x;
int func3(int x) {
return x;
}
int func4(x) {
return x;
}
FunctionLiteralsTest() {}
static void testMain() {
var test = new FunctionLiteralsTest();
test.testArrow();
test.testArrowArrow();
test.testArrowBlock();
test.testBlock();
test.testBlockArrow();
test.testBlockBlock();
test.testFunctionRef();
}
void testArrow() {
checkIntFunction(42, (x) => x, 42);
checkIntFunction(42, (dynamic x) => x, 42);
}
void testArrowArrow() {
checkIntFuncFunction(84, (x) => (y) => x + y, 42);
checkIntFuncFunction(84, (dynamic x) => (y) => x + y, 42);
}
void testArrowBlock() {
checkIntFuncFunction(
84,
(x) => (y) {
return x + y;
},
42);
checkIntFuncFunction(
84,
(int x) => (y) {
return x + y;
},
42);
}
void testBlock() {
checkIntFunction(42, (x) {
return x;
}, 42);
checkIntFunction(42, (int x) {
return x;
}, 42);
}
void testBlockArrow() {
checkIntFuncFunction(84, (x) {
return (y) => x + y;
}, 42);
checkIntFuncFunction(84, (int x) {
return (y) => (x + y) as int;
}, 42);
}
void testBlockBlock() {
checkIntFuncFunction(84, (x) {
return (y) {
return x + y;
};
}, 42);
checkIntFuncFunction(84, (int x) {
return (y) {
return x + y;
};
}, 42);
}
void testFunctionRef() {
checkIntFunction(42, func1, 42);
checkIntFunction(42, func2, 42);
checkIntFunction(42, func3, 42);
checkIntFunction(42, func4, 42);
}
}
main() {
FunctionLiteralsTest.testMain();
}