检查谓词（第二个参数）是否对集合的所有元素（第一个参数）都是真实的。换句话说，您将获得一个对象的数组集合。谓语pre将一个对象的属性，你需要返回true ，如果它的值是truthy 。否则，返回false 。在JavaScript中， truthy值是在布尔上下文中计算时转换为true的值。请记住，您可以通过点表示法或[]表示法访问对象属性。如果卡住，请记得使用Read-Search-Ask 。尝试配对程序。编写自己的代码。

```yml tests: - text: '

truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex")

应该返回true。' testString: 'assert.strictEqual(truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex"), true);' - text: '

truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex")

应该返回false。' testString: 'assert.strictEqual(truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex"), false);' - text: '

truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 0}, {"user": "Dipsy", "sex": "male", "age": 3}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age")

应该返回false。' testString: 'assert.strictEqual(truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 2}, {"user": "Dipsy", "sex": "male", "age": 0}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age"), false);' - text: '

truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true}, {"name": "FastFoward", "onBoat": null}], "onBoat")

应该返回false' testString: 'assert.strictEqual(truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true}, {"name": "FastForward", "onBoat": null}], "onBoat"), false);' - text: '

truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true, "alias": "Repete"}, {"name": "FastFoward", "onBoat": true}], "onBoat")

应该返回true' testString: 'assert.strictEqual(truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true, "alias": "Repete"}, {"name": "FastForward", "onBoat": true}], "onBoat"), true);' - text: 'truthCheck([{"single": "yes"}], "single")应该返回true' testString: 'assert.strictEqual(truthCheck([{"single": "yes"}], "single"), true);' - text: 'truthCheck([{"single": ""}, {"single": "double"}], "single")应该返回false' testString: 'assert.strictEqual(truthCheck([{"single": ""}, {"single": "double"}], "single"), false);' - text: 'truthCheck([{"single": "double"}, {"single": undefined}], "single")应返回false' testString: 'assert.strictEqual(truthCheck([{"single": "double"}, {"single": undefined}], "single"), false);' - text: 'truthCheck([{"single": "double"}, {"single": NaN}], "single")应返回false' testString: 'assert.strictEqual(truthCheck([{"single": "double"}, {"single": NaN}], "single"), false);' ```