.parseInt() The base can be defined by adding prefixes to the numbers we want to parse: No prefix - … For example, a string containing the single character U+1F600 "Emoji grinning face" will have length 2.

You can create simple strings using either single or double quotes: More advanced strings can be created using escape sequences:
The best one in my opinion is to use the Number object, in a non-constructor context (without the newkeyword): This takes care of the decimals as well. For currency formatting, I used Number.prototype.toFixed() to convert a number to string to have always two decimal digits.. Watch out for separators between digits: In the case you need to parse a string with decimal separators, use Intl.NumberFormatinstead. Accessing the individual code units in such a string using brackets may have undesirable consequences such as the formation of strings with unmatched surrogate code units, in violation of the Unicode standard. Particularly, I'll be covering how to convert a Number to a String in this article. Date("2017-09-30"));    // returns 1506729600000 Managing data is one of the fundamental concepts of programming.
to convert variables to numbers:JavaScript global methods can be used on all JavaScript data types.These are the most relevant methods, when working with numbers:Trying to do arithmetic with a non-numeric string will result in Number properties belongs to the JavaScript's number object wrapper called The reference contains descriptions and examples of all Number properties and methods.If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: To format phone number properly we need to first make sure that the input is numeric and is not more than 10 numbers. object (typeof = object).There are 3 JavaScript methods that can be used CAUTION: if you edit this page, do not include any characters above U+FFFF, until MDN bug 857438 is fixed (

// x will be NaN (Not a Number) Now once we have our input ready we can format it in US phone format.

var x = 100 / "Apple"; 

Number(new See also Return the string in all lowercase or all uppercase, respectively.Template literals are enclosed by the back-tick (` `) (Any new line characters inserted in the source are part of the template literal. If you don't specify it, JavaScript will not round the number.In JavaScript, a number can be a primitive value (typeof = number) or an

methods and properties.All number methods can be used on any type of numbers (literals, variables, or expressions):A parameter defines the number of characters behind the decimal point:The parameter is optional. (Examples should be added to this page after MDN bug 857438 is fixed.) Using normal strings, you would have to use the following syntax in order to get multi-line strings:To get the same effect with multi-line strings, you can now write:In order to embed expressions within normal strings, you would use the following syntax:Now, with template literals, you are able to make use of the syntactic sugar making substitutions like this more readable:For example, there are actually two different sort orders in German, Some German words conjugate with extra umlauts, so in dictionaries it’s sensible to order ignoring umlauts (except when ordering words differing Get the latest and greatest from MDN delivered straight to your inbox.The newsletter is offered in English only at the moment. Because of this, JavaScript offers plenty of tools to parse various data types, allowing you to easily interchange the format of data. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. values, because JavaScript treats primitive values as objects when executing Sign in to enjoy the benefits of an MDN account. Example Input: 9809142333 Output: (980) 914-2333 Format phone number without country code. If you need to format currency for a different country / locale, you would need to add some modifications to the currencyFormat method. All number methods can be used on any type of numbers (literals, variables, or expressions): Example.

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