In the example above, JavaScript will return the last variableroleand ignore the previous variables you write down next to thereturnstatement. When you need to return multiple values, you need to wrap the values
It wouldn’t sound too obvious but sometimes your function might need to return multiple values. For instance, in one of the applications I’m working on, I have a JavaScript function where I have to calculate two different values and return them. So, I needed to return two values from ...
sayHello(firstName, lastName){ let msg = "Greetings "; function intro(){ return msg + firstName = " " + lastName; } return into(); } sayHello("Professor" , "Falken"); //returns "Greetings Professor Falken"; Listing 5-8Using a Closure to Illustrate an Inner Function’s Access to ...
Functions return only one value. How can we simulate returning multiple values from a function?THE SOLOPRENEUR MASTERCLASS Launching June 24th When we call a function in JavaScript, we can only return one value using the return statement:
varelements =document.getElementsByTagName('input');varn = elements.length;// Assume we have 10 elements for this examplevarmakeHandler =function(num) {// Outer functionreturnfunction() {// Inner functionconsole.log("This is element #"+ num); }; };for(vari =0; i < n; i++) { ele...
最开始,我们需要统一一些基本术语。从现在开始,我们将函数(functions)的概念定义为“执行一个明确的动作并提供一个返回值的独立代码块”。函数可以接收作为值传递给它的参数(arguments),函数可以被用来提供返回值(return value),也可以通过调用(invoking)被多次执行。
variables are properties of a global objectand that local variables are properties of a special call object, we can return to the notion of variable scope and reconceptualize it. This new description of scope offers a useful way to think about variables in many contexts; it provides a powerful...
Additionally, as you already noticed in the previous section, anonymous functions can be used to avoid creating excessive temporary variables and make your code cleaner:math_ops = { add: def(a, b): return a+b;, sub: def(a, b): return a-b;, mul: def(a, b): return a*b;, div:...
(name){privateVar=name;}functionpublicGetName(){privateFunction();}/** reveal methods and variables by assigning them to object properties */return{setName:publicSetName,greeting:publicVar,getName:publicGetName};})();myRevealingModule.setName('Mark');// prints Name: MarkmyRevealingModule.get...
, Parameters: ["Purple"], }); const response = await docClient.send(command); console.log(response); return response; }; 有关API 的详细信息,请参阅 适用于 JavaScript 的 AWS SDK API 参考ExecuteStatement中的。 以下代码示例演示了如何使用 GetItem。 适用于 JavaScript (v3) 的...