What's () => //example snippet in JavaScript or C#

What is the purpose of the code snippet ()=> //codes

and what does it do? Please provide an example in C#.

List<Task> Tasks = new List<Task>();
 var taskCustomer = Task.Factory.StartNew(() =>
 {
   using (NorthContext dbContext=new NorthContext())
   {
       model.CustomerList = dbContext.Customers.Where(
       cus=>cus.ContactName.Contains(search)).ToList();
   }
});
Tasks.Add(taskCustomer);

Now, can you also show an example in JavaScript?

window.addEventListener('resize', () => this.onResize()); 

And don't forget to call this.onResize(); after!

Answer №1

Within the realm of javascript/Typescript, we commonly refer to it as an arrow function.

FROM DOCUMENTATION

An arrow function expression offers a more concise syntax compared to a regular function expression and does not possess its own this, arguments, super, or new.target. These types of function expressions are most suitable for non-method functions and cannot serve as constructors.

Meanwhile, in C#,

It goes by the name of lambda expression.

A lambda expression is essentially an anonymous function that enables you to create delegates or expression tree types. By using lambda expressions, you can define local functions that are capable of being passed as arguments or returned as values from function calls. Lambda expressions prove to be incredibly useful when crafting LINQ query expressions.

Answer №2

In the programming language C#, a lambda expression like () => {//...} provides a quick way to define a method and pass it as an argument to another method. This type of expression requires no parameters and executes the code specified within curly braces. Officially, according to documentation:

A lambda expression serves as an anonymous function that aids in creating delegates or expression tree types. It enables you to write localized functions that can be passed around as arguments or returned from other functions. Lambda expressions prove to be incredibly useful for constructing LINQ query expressions.

Conversely, JavaScript refers to this concept as an arrow function. As mentioned in Mozilla Developer Docs:

An arrow function expression boasts a more succinct syntax than a traditional function expression and lacks its own versions of 'this', 'arguments', 'super', or 'new.target'. These function expressions are most suitable for non-method functions and cannot act as constructors.

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