# JavaScript Number Methods

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● Number Methods and Properties

 Primitive values cannot have properties and methods. 

 But with JSP, methods & properties are also available to primitive values,

because JSP treats primitive values as objects when executing methods and properties.

● The toString() Method

 toString() returns a number as a string.

All number methods can be used on any type of numbers.

● The toExponential() Method

 toExponential() returns a string, with a number rounded and written using exponential notation. A parameter defines the number of characters behind the decimal point.

The parameter is optional. When I don't specify it, JSP will not round the number.

● The toFixed() Method

 toFixed() returns a string, with the number written with a specified number of decimals.

● The valueOf() Method

 valueOf() returns a number as a number.

In JavaScript, a number can be a primitive value (typeof = number) or an object (typeof = object).

The valueOf() method is used internally in JavaScript to convert Number objects to primitive values.

There is no reason to use it in my code. All JSP data types have a valueOf() and a toString() method.

● Converting Variables to Numbers

 There are 3 JavaScript methods that can be used to convert variables to numbers.

• The Number() method
• The parseInt() method
• The parseFloat() method

These methods are not number methods, but global JavaScript methods.

These are the most relevant methods, when working with numbers.

http://www.w3schools.com/js/js_number_methods.asp

● The Number() Method

 Number() can be used to convert JavaScript variables to numbers.

Used on Date(), the Number() method returns the number of milliseconds since 1.1.1970.

● The parseInt() Method

 parseInt() pares a string and returns a whole number. Spaces are allowed. Only the first number is returned.

● The parseFloat() Method

 parseFloat() parses a string and returns a number. Spaces are allowed. Only the first number is returned.

If the number cannot be converted, NaN is returned.

● Number Properties

 Number properties belongs to the JSP's number object wrapper called Number. These properties can only be accessed as Number.MAX_VALUE.

Using myNumber.MAX_VALUE, where myNumber is a variable, expression, or value, will return undefined.

http://www.w3schools.com/js/js_number_methods.asp