JavaScript Symbol function is used to identify the properties of an object.
Note:
- It always returns 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 split 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 whose property names are excluded from the environment.
