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## How do you write a function in JavaScript?

A **JavaScript function** is defined with the **function** keyword， followed by a name， followed by parentheses (). **Function** names can contain letters， digits， underscores， and dollar signs (same rules as variables). The parentheses may include parameter names separated by commas: (parameter1， parameter2， )

## What is function in JavaScript with example?

**JavaScript** a **function** allows you to define a block of code， give it a name and then execute it as many times as you want. A **function** can be defined using **function** keyword and can be executed using () operator. A **function** can include one or more parameters.

## What are functions in JavaScript?

A **function in JavaScript** is similar to a procedure—a set of statements that performs a task or calculates a value， but for a procedure to qualify as a **function**， it should take some input and return an output where there is some obvious relationship between the input and the output.

## How do you declare a function?

A **function declaration** is made of **function** keyword， followed by an obligatory **function** name， a list of parameters in a pair of parenthesis (para1， ， paramN) and a pair of curly braces {} that delimits the body code.

## What is not a function?

A **function** is a relation in which each input has only one output. In the relation ， y is a **function** of x， because for each input x (1， 2， 3， or 0)， there is only one output y. x is **not a function** of y， because the input y = 3 has multiple outputs: x = 1 and x = 2.

## What is the most basic function?

The parent **function** is the **most basic function** in the family of **functions**， the **function** from which all the other **functions** in the family can be derived. A family of **functions** is a group of **functions** that can all be derived from transforming a single **function** called the parent **function**.

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## What are the 8 types of functions?

The eight **types** are linear， power， quadratic， polynomial， rational， exponential， logarithmic， and sinusoidal.

## Is vertical line a function?

If any **vertical line** intersects a graph more than once， the relation represented by the graph is not a **function**. From this we can conclude that these two graphs represent **functions**. The third graph does not represent a **function** because， at most x-values， a **vertical line** would intersect the graph at more than one point.

## Are two vertical lines on a graph a function?

If any **vertical line** intersects a **graph** more than once， the relation represented by the **graph** is not a **function**. Notice that any **vertical line** would pass through only one point of the **two graphs** shown in parts (a) and (b) of Figure 13. From this we can conclude that these **two graphs** represent **functions**.

## Is a straight horizontal line a function?

Yup. It represents a **function** that gives the same output no matter what input you give it. Usually written as f(x)=a (so， for instance， f(x)=5 is one such **function**)， and called a constant **function**.

## Why is xa vertical line?

Try this Drag the points A or B and note the **line** is **vertical** when they both have the same x-coordinate. A **vertical line** is one the goes straight up and down， parallel to the y-axis of the coordinate plane. All points on the **line** will have the same x-coordinate. Any point on the **vertical line** satisfies the equation.

## Is Y =- 2 horizontal or vertical?

An Example of Graphing a **Horizontal** Line

Graph the **horizontal** line **y** = − **2 y** = – **2 y**=−**2**.