Analysis of JavaScript dynamic types, string values and numerical examples

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JavaScript has dynamic types

JavaScript has dynamic types. This means that the same variable can be used as different types:

Example

Var x; / / now x is undefined

Var x = 7; / / now x is a numeric value

Var x = "Bill"; / / now x is a string value

JavaScript string value

A string (or text string) is a string of characters (such as "Bill Gates").

The string is surrounded by quotation marks. You can use single or double quotation marks:

Example

Var carName = "Porsche 911"; / / use double quotation marks

Var carName = 'Porsche 911'; / / use single quotation marks

You can use quotation marks within a string, as long as they do not match the quotation marks that surround the string:

Example

Var answer = "It's alright"; / / single quotation marks within double quotation marks

Var answer = "He is called 'Bill'"; / / single quotation marks within double quotation marks

Var answer ='He is called "Bill"; / / double quotation marks within single quotation marks

JavaScript value

JavaScript has only one numeric type.

You can write a value with or without a decimal point:

Example

Var x1 = 34.00; / / with decimal point

Var x2 = 34; / / without decimal point

Very large or ultra-small values can be written by scientific counting:

Example

Var y = 123e5; / / 12300000

Var z = 123eMur5; / / 0.00123

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