# JavaScript Global Reference

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The JavaScript global properties and functions can be used with all the built-in JavaScript objects.

## JavaScript Global Properties

Property | Description
--- | ---
Infinity | A numeric value that represents positive/negative infinity
NaN | "Not-a-Number" value
undefined | Indicates that a variable has not been assigned a value

## JavaScript Global Functions

Function | Description
--- | ---
decodeURI() | Decodes a URI
decodeURIComponent() | Decodes a URI component
encodeURI() | Encodes a URI
encodeURIComponent() | Encodes a URI component
escape() | Deprecated in version 1.5. Use encodeURI() or encodeURIComponent() instead
eval() | Evaluates a string and executes it as if it was script code
isFinite() | Determines whether a value is a finite, legal number
isNaN() | Determines whether a value is an illegal number
Number() | Converts an object's value to a number
parseFloat() | Parses a string and returns a floating point number
parseInt() | Parses a string and returns an integer
String() | Converts an object's value to a string
unescape() | Deprecated in version 1.5. Use decodeURI() or decodeURIComponent() instead

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