CodesJava

Easy learning with example program codes

Symbol function JavaScript

JavaScript Symbol function is used to identify the properties of an object.

Note:

  • It always return a unique value.
  • A symbol value may be used as an identifier for object properties.
  • Like numbers or strings, Symbols are also immutable.

Syntax:

Symbol([description])   

Parameters:
description: It represents the symbol description.

JavaScript Symbol Methods

for() Method:
Use: To find out the existing symbol in a runtime-wide symbol registry with the provided key.

keyFor() Method:
Use: To search for the key of the global symbol.

toString() Method:
Use: To retrieve a string representation of an object.

 

JavaScript Symbol Properties

Symbol.hasInstance: 
It is used to check if a constructor object recognizes an object as its instance or not.

Symbol.isConcatSpreadable:
It is used to check if an object is flattened to its array elements.

Symbol.match:
It is used to check the match of a regular expression against a string.

Symbol.prototype:
It represents the Symbol constructor’s prototype.

Symbol.replace:
It is used to replace the matched sub strings of a string.

Symbol.search:
it returns the index within a string that matches the regular expression.

Symbol.split:
It is used to splits a string at the indices that match a regular expression.

Symbol.toStringTag:
It creates the default string description of an object.

Symbol.unscopables:
An object value of whose property names are excluded from the with environment.

 

Please follow and like us:
error








Copyright © 2019 CodesJava DMCA.com Protection Status