## How do you create a function in node JS?

exports. new_user = functions. https. onRequest((req, res) => { var abc=“; if(a==’true’) { abc=Function_A();//Get the results of Function A } else { abc=Function_B();//Get the results of Function B //Then Call Function A } });

## How do you declare a function?

You can declare a function **by providing its return value, name, and the types for its arguments**. The names of the arguments are optional. A function definition counts as a function declaration.

## How do you define a function in JavaScript?

**JavaScript methods** are actions that can be performed on objects. A **JavaScript method** is a property containing a function definition. **Methods** are functions stored as object properties.

## What is a node js function?

**js Functions**. A **function** is a set of statements that is invoked in an application to perform a certain action or yield a desired result based on the logic in the code. **Node**.

## Whats is a function?

A technical definition of a function is: **a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output**. … We can write the statement that f is a function from X to Y using the function notation f:X→Y.

## What is a function expression?

Function Expression **allows us to create an anonymous function which doesn’t** have any function name which is the main difference between Function Expression and Function Declaration. A function expression can be used as an IIFE (Immediately Invoked Function Expression)which runs as soon as it is defined.

## What are the 4 types of functions?

**Types of Functions**

- One – one function (Injective function)
- Many – one function.
- Onto – function (Surjective Function)
- Into – function.
- Polynomial function.
- Linear Function.
- Identical Function.
- Quadratic Function.

## What is function explain with example?

A **function is a mapping from a set of inputs (the domain) to a set of possible outputs (the codomain)**. The definition of a function is based on a set of ordered pairs, where the first element in each pair is from the domain and the second is from the codomain.

## What is a not a function?

Horizontal lines are functions that have a range that is a single value. **Vertical lines are not** functions. The equations y=±√x and x2+y2=9 are examples of non-functions because there is at least one x-value with two or more y-values.

## How does a function work?

A function is an equation that has only one **answer for y for every x**. A function assigns exactly one output to each input of a specified type. It is common to name a function either f(x) or g(x) instead of y. f(2) means that we should find the value of our function when x equals 2.

## What are the two types of functions?

**The various types of functions are as follows:**

- Many to one function.
- One to one function.
- Onto function.
- One and onto function.
- Constant function.
- Identity function.
- Quadratic function.
- Polynomial function.

## How do you define a function?

function, in mathematics, an expression, rule, or law that **defines a relationship between one variable (the independent variable) and another variable (the dependent variable)**. Functions are ubiquitous in mathematics and are essential for formulating physical relationships in the sciences.