3. 描述出现“expected to return a value in arrow function”错误的可能原因 这个错误通常发生在以下几种情况: 没有返回值:箭头函数内部没有使用return语句返回任何值。 隐式返回值缺失:在箭头函数体中使用大括号{}包围了多行代码,但没有显式地返回任何值。在ES6中,如果箭头函数体只包含一条语句且不需要大括号...
The error prompt “Array.prototype.map() expects a return value from Arrow Function” message may pop up in Javascript. There are several scenarios where you may face this problem and there are mutiple wyas of bypassing this problem. Generally, while using the “Array.prototype.map()” functi...
报错： Expected to return a value at the end of arrow function consistent-return 修改为： 在检测时候，就会被置空为，没有return; 且报错no-empty 以下为正确修改：错误示例：
Why do I get this error? Can someone please help me? "Expected to return a value at the end of async arrow function consistent-return." I use it on an onChange since I would like the URL put in the input to be used. const handleChange = ...
map用于返回数组。如果你不想返回任何东西，只需遍历数组，然后不要使用map，像这样使用forEach。
map用于返回数组。如果你不想返回任何东西，只需遍历数组，然后不要使用map，像这样使用forEach。
You can also write the same function as a function expression, like this: const sayHiStranger = function () { return 'Hi, stranger!' } JavaScript arrow functions are always expressions. Here’s how you could rewrite the function above as an arrow function expression using the fat arrow not...
Example 1: Arrow Function With No Argument If a function doesn't take any argument, then you should use empty parentheses. For example, constsayHello =()=>"Hello, World!"; // call the arrow function and print its return valueconsole.log(sayHello());// Output: Hello, World!
string { return $this->map[$item] ?? null; } } class Collection { public function handle(?string $item): void { // Do something but function is void } } Expected output No error, as void is a valid "return value" for arrow functions / callables....
self.age = 0; setInterval(function growUp() { // The callback refers to the `self` variable of which // the value is the expected object. self.age++; }, 1000); } 或者是,透過綁定函數的作法來綁定 this 變數到 growUp 函數。 不過現在箭頭函數會自動將 this 變數綁定到其定義時所在的物件,...