How do you declare a function as a variable in JavaScript?
6 Ways to Declare JavaScript Functions
- JavaScript code that forms the function body.
- The list of parameters.
- The variables accessible from the lexical scope.
- The returned value.
- The context this when the function is invoked.
- Named or an anonymous function.
- The variable that holds the function object.
Where can we declare a function in JavaScript?
A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses ().
How do you define a function in JavaScript?
Function declarations A function definition (also called a function declaration, or function statement) consists of the function keyword, followed by: The name of the function. A list of parameters to the function, enclosed in parentheses and separated by commas.
How to declare the name of a function in JavaScript?
The function declaration function hello (name) {…} create a variable hello that is hoisted to the top of the current scope. hello variable holds the function object and hello.name contains the function name: ‘hello’. The function declaration matches for cases when a regular function is needed.
How to refer to a variable in JavaScript?
It is assigned a reference to a function, after which the function it references can be invoked using parentheses, just like a normal function declaration. The example above references anonymous functions… functions that do not have their own name. You can also use variables to refer to named functions.
How does the function declaration work in JavaScript?
The function declaration creates a variable in the current scope with the identifier equal to the function name. This variable holds the function object. The function variable is hoisted up to the top of the current scope, which means that the function can be invoked before the declaration (see this chapter for more details).
How to declare a variable in JavaScript example?
JavaScript Variable: Declare, Assign a Value with Example. Variables are used to store values (name = “John”) or expressions (sum = x + y). Before using a variable, you first need to declare it. You have to use the keyword var to declare a variable like this: var name;