What is the number?
Its an arithmetic value used for counting and making calculations.
What is the Number in Javascript ?
Number is a Javascript built-in object that is used to represent the numeric values.
Numbers in Javascript may be of any type Integer or Floating-point value.
Note :
Number object in Javascript follows IEEE standard for representing floating-point values.
Why is the Number Object used in javascript ?
Number object is used to perform mathematical tasks on numerical values.
Number object is used to perform calculations like counting allows us to implement new workflow ideas.
How to construct a Number Object in javascript ?
There are two ways to construct Date object,
1. By directly assigning numbers to variables.
2. By Number() constructor.
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1. By directly assigning numbers to variables.
We can directly assign the numbers to a variable.
The number can be of anything, it can be integer or floating-point value.
Syntax :
var {variable_name} = {numeric_value};
Example :
<!DOCTYPE html>
<html>
<head>
<title>Our title</title>
<script type="text/javascript">
var a = 10; // Numeric value
var b = 37; // Numeric value
var c = 120; // Numeric value
var d = 11.34; // Floating Point value
var e = 19e2; // Exponent value
document.write("The value of a = "+a+"<br/>");
document.write("The value of b = "+b+"<br/>");
document.write("The value of c = "+c+"<br/>");
document.write("The value of d = "+d+"<br/>");
document.write("The value of e = "+e+"<br/>");
</script>
</head>
<body></body>
</html>
Output :
The value of a = 10
The value of b = 37
The value of c = 120
The value of d = 11.34
The value of e = 1900
2. By Number() constructor.
By using Number constructor we can create number object.
If the numeric value passed in the objext is not a number, Then Javascript will return as NaN(Not a Number).
Syntax :
var {variable_name} = new Number({numeric_value});
Example :
<!DOCTYPE html>
<html>
<head>
<title>Our title</title>
<script type="text/javascript">
var a = new Number(31);
document.write("The value of a = "+a+"<br/>");
var b = new Number("AbdulKalaam");
document.write("The value of b = "+b+"<br/>");
</script>
</head>
<body></body>
</html>
Output :
The value of a = 31
The value of b = NaN
What are the number constants in Javascript ?
There are five number constants in javascript which are listed below,
1. MIN_VALUE
This returns the largest minimum value.
2. MAX_VALUE
This returns the largest maximum value.
3. POSITIVE_INFINITY
This returns positive infinity, overflow value.
4. NEGATIVE_INFINITY
This returns negative infinity, overflow value.
5. NaN
This returns “Not a Number” value.
There are few methods for Number object listed below.
| Sno | Method / Function | Description |
| 1 | isFinite() | isFinite() method determines whether the given value is a finite number. |
| 2 | isInteger() | isInteger() method determines whether the given value is an integer. |
| 3 | parseFloat() | parseFloat() method converts the given string into a floating point number. |
| 4 | parseInt() | parseInt() method converts the given string into an integer number. |
| 5 | toExponential() | toExponential() method returns the string that represents exponential notation of the given number. |
| 6 | toFixed() | toFixed() method returns the string that represents a number with exact digits after a decimal point. |
| 7 | toPrecision() | toPrecision() method returns the string representing a number of specified precision. |
| 8 | toString() | toString() method returns the given number in the form of string. |