Properties (JScript) 

A property is a value or set of values (in the form of an array or object) that is a member of an object. The following sections link to information that explains how to use the properties in JScript.

In This Section

• 0...n Properties
  Returns the actual value of individual arguments from an arguments object returned by the arguments property of an executing function.

• $1...$9 Properties
  Returns the nine most-recently memorized portions found during pattern matching.

• arguments Property
  Returns the arguments object for the currently executing Function object.caller Property

• callee Property
  Returns the Function object being executed that is the body text of the specified Function object.

• caller Property
  Returns a reference to the function that invoked the current function.

• constructor Property
  Specifies the function that creates an object.

• description Property
  Returns or sets the descriptive string associated with a specific error.

• E Property
  Returns the mathematical constant e, the base of natural logarithms.

• global Property
  Returns a Boolean value indicating the state of the global flag (g) used with a regular expression.

• ignoreCase Property
  Returns a Boolean value indicating the state of the ignoreCase flag (i) used with a regular expression.

• index Property
  Returns the character position where the first successful match begins in a searched string.

• Infinity Property
  Returns an initial value of Number.POSITIVE_INFINITY.

• input Property ($_)
  Returns the string against which a regular expression search was performed.

• lastIndex Property
  Returns the character position where the next match begins in a searched string.

• lastMatch Property ($&)
  Returns the last matched characters from any regular expression search.

• lastParen Property ($+)
  Returns the last parenthesized submatch, if any, from any regular expression search.

• leftContext Property ($`)
  Returns the characters from the beginning of a searched string up to the position before the beginning of the last match.

• length Property (arguments)
  Returns the actual number of arguments passed to a function by the caller.

• length Property (Array)
  Returns an integer value one higher than the highest element defined in an array.

• length Property (Function)
  Returns the number of arguments defined for a function.

• length Property (String)
  Returns the length of a String object.

• LN10 Property
  Returns the natural logarithm of 10.

• LN2 Property
  Returns the natural logarithm of 2.

• LOG10E Property
  Returns the base-10 logarithm of e, the base of natural logarithms.

• LOG2E Property
  Returns the base-2 logarithm of e, the base of natural logarithms.

• MAX_VALUE Property
  Returns the largest number representable in JScript. Equal to approximately 1.79E+308.

• message Property
  Returns an error message string.

• MIN_VALUE Property
  Returns the number closest to zero that JScript can represent. Equal to approximately 5.00E-324.

• multiline Property
  Returns a Boolean value indicating the state of the multiline flag (m) used with a regular expression.

• name Property
  Returns the name of an error.

• NaN Property
  A special value that indicates that an arithmetic expression returned a value that was not a number.

• NaN Property (Global)
  Returns the special value NaN indicating that an expression is not a number.

• NEGATIVE_INFINITY Property
  Returns a value more negative than the largest negative number (-Number.MAX_VALUE) that JScript can represent.

• number Property
  Returns a value more negative than the largest negative number (-Number.MAX_VALUE) that JScript can represent.

• PI Property
  Returns the ratio of the circumference of a circle to its diameter, approximately 3.141592653589793.

• POSITIVE_INFINITY Property
  Returns a value larger than the largest number (Number.MAX_VALUE) that JScript can represent.

• propertyIsEnumerable Property
  Returns a Boolean value indicating whether a specified property is part of an object and if it is enumerable.

• prototype Property
  Returns a reference to the prototype for a class of objects.

• rightContext Property ($')
  Returns the characters from the position following the last match to the end of the searched string.

• source Property
  Returns a copy of the text of the regular expression pattern.

• SQRT1_2 Property
  Returns he square root of 0.5, or one divided by the square root of 2.

• SQRT2 Property
  Returns the square root of 2

• undefined Property
  Returns an initial value of undefined.

Related Sections

• JScript Reference
  Lists elements that comprise JScript Language Reference and links to topics that explain the details behind the proper use of language elements.

• .NET Framework Reference
  Lists links to topics that explain the syntax and structure of the .NET Framework class library and other essential elements.