JavaScript Numbers


Most programming languages define different types of numbers like long, integers, short, decimal and so on. This is not the case with JavaScript where numbers always are stored as a 64 bits, double precision floating point numbers.

So you could say that the Number object is just a wrapper object that allows you to work with numerical values.

var a = 6.88; // A decimal number
var b = 8; // No decimals
var c = 2345e3; // An extra large number. Equals: 2345000
var d = 2345e-8; // A very small number. Equals: 0.00002345
var e = 0.4 + 0.2; // equals 0.6000000000000001
var f = (0.4 * 10 + 0.2 * 10) / 10;  // Equals: 0.6

Number properties

Number.EPSILONThis is the smallest interval between two numbers.

Number.MAX_SAFE_INTEGERThe maximum safe integer.

Number.MAX_VALUEThe largest positive number.

Number.MIN_SAFE_INTEGERThe minimum safe integer.

Number.MIN_VALUEThis is the positive number closest to zero.

Number.NaNThis is special for "not a number" value.

Number.NEGATIVE_INFINITYThis represents a negative infinity.

Number.POSITIVE_INFINITYThis represents a positive infinity.

Number.prototypeAllows the addition of properties to Number object.

Number methods

Number.isNaN()Check if the passed value is NaN.

Number.isFinite()Check if the passed value is a finite number.

Number.isInteger()Check if the passed value is an integer.

Number.isSafeIntegerCheck if the passed value is a safe integer.

Number.parseFloatThe value here is the same as parseFloat() of the global object.

Number.parseIntThe value here is the same as parseInt() of the global object.

Learn more about JavaScript Numbers Methods Learn more about JavaScript Arithmetics

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JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.

The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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