What is a javascript variable?

Answer 1

A variable in JavaScript is an identifier that provides a storage location used to store a data value. The data stored at a particular location in memory. That we accessed by using the variable name.

In JavaScript programs, a script will have to store the bits of information temporarily. It needs to do its work. It can store this data in variables. In other words, A variable is a symbolic name given to a location in the computer memory. Where we store the value, which can be used in the program. The value of the variable can change during the execution of the program. It may take different values at different times during the execution of the program.

The name of the variable that we choose must be meaningful to understand, what it represents in the program.

For example

var Price = 100;

Rules to follow:

• The name of the variable can contain a letter, digits, underscore(_), and dollar sign($).
• They must begin with a letter, not with a digit.
• Uppercase and Lowercase are distinct. That means the variable Total is not the same as total or TOTAl.
• It should not be a keyword.
• White space does also not allow.
• Variable can be any length.

Hope this helps. Thank you

Answer 2

In most programming languages you have to specify the variable-type before you declare the variable, (String, int, double). But in javascript you just have to type var..

Example:

var variable1 = "Hello world"; String variable

var variable2 = 123; int variable

Answer 3

Variables are stores of data. These take on several types, Integer, String and Array to name a few.

To declare a Variable simply type:

var THEVARNAME;

You can set the value right then and there:

var THEVARNAME = "helloworld";

And you can change it once declared.

THEVARNAME = "goodbye";

You can also detect whether it has been set in the scope (e.g. Locally and Globally)

If(!THEVARNAME){ alert("THEVARNAME not set"); } else { alert(THEVARNAME); }

Remember JavaScript is a Case Sensitive language. var, Var and VAR are not the same and Thevarname, TheVarName and THEVARNAME are not the same.

Answer 4

variable are the containers for some value which can be further used for calculation and their values can be changed.

In javascript, variables are define as

var var_name;

It can be assigned to some value like as follow

var_name=10;

Answer 5

A Javascript variable is a letter or combination of letters, numbers, and symbols that a value is stored in. This value can be a string (words, letters), a boolean value (true/false), or a numerical value (125).

Answer 6

Either:

function foo(){

//function body

}

or

var foo = function(){

//function body

}

The last example is preferable since it is consistent to creating properties to objects, even though they work more or less the same.

Answer 7

A variable in JavaScript is an identifier that provides a storage location used to store a data value. The data stored at a particular location in memory. That we accessed by using the variable name.

In JavaScript programs, a script will have to store the bits of information temporarily. It needs to do its work. It can store this data in variables.

The name of the variable that we choose must be meaningful to understand, what it represents in the program.

For example:

var Price = 100;

You can use var and let Keyword declare variable in JavaScript.

Var Keyword:

Var keyword used to declare a variable like let do. It has function scoped, while the variable declared with var has global scope in the program.

Let Keyword:

Let keyword, used to declare a variable. With let, the scope of a variable has limited scope to the block where it declared. However, It can be only available inside the block where you declare it.

Hope this helps. Thank you

Answer 8

to set a variable it is just "var" then you have a space and give it the attributes that you want it to preform.

Answer 9

A variable in JavaScript is declared with the varkeyword.

Answer 10

var var1;
var var2= value;