First class function in javascript
Higher Order Functions, callback function, returning a function in javascript
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What is First-class-function?
In javascript, A function can be called a first-class-function, if
It is passing as an argument in another function
It returns as a return value.
It is treated as a variable value.
Examples of First class Function
- Passing as an argument
Here we pass powerTwo in the Powercube function.
- Assigning function as a variable value
- Returning a function
Higher-order-function
A function which passes another function as an argument or returns a function is called a higher-order function.
In the above examples welcomemessege() and Powercube() are higher-order functions.
Callback function
When a function passes as an argument in any function, is called a callback function.
In the above examples, powerTwo() is a callback function.
