![]() This keyword is a confusing aspect of JavaScript (check this article for a detailed explanation of this).īecause functions create their execution context, often it is difficult to detect this value.ĮCMAScript 2015 improves this usage by introducing the arrow function, which takes the context lexically (or simply uses this from the immediate outer scope). You are free to use rest parameters (.params), though. arguments object is not available in the arrow function (contrary to other declaration types that provide arguments object).However, the engine can infer its name from the variable holding the function The arrow function does not create its execution context but takes it lexically (contrary to function expression or function declaration, which creates its own this depending on invocation).The function declared using a fat arrow has the following properties: The following example uses a shorthand method definition in an object literal:ĪbsValue is an arrow function that calculates the absolute value of a number. const factorial = function(n) that delimits the body statements. It is possible to use a function expression and assign it to a regular variable, e.g. You will learn about them in later tutorials.Inside factorial() a recursive call is made using the variable that holds the function: factorial(n - 1). ![]() Note: In ES2015, JavaScript expressions are written as arrow functions. The function above is called an anonymous function. And the function is called using the variable name. Here the function is treated as an expression. In the above program, variable x is used to store the function. can be used as variable value for other variables The syntax to declare a function is: function nameOfFunction () In this tutorial, you will learn about user-defined functions. For example, Math.sqrt() is a function to calculate the square root of a number. ![]() JavaScript also has a huge number of inbuilt functions. You can create two functions to solve this problem:ĭividing a complex problem into smaller chunks makes your program easy to understand and reusable. Suppose you need to create a program to create a circle and color it. A function is a block of code that performs a specific task. ![]()
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