JavaScript Symbol Complete Reference

The symbol is a data type of primitive data type. The Symbol() function returns the symbol value type. The value returned from Symbol() is unique.

Syntax:

[Symbol.peoperty](string)

Example: JavaScript code to show the working of this function. 

Javascript

<script>
   // Creating some arrays
   const Array1 = [1, 2, 3];
   const Array2 = [4, 5, 6];

   // Calling concat() function
   let Array3 = Array1.concat(Array2);

   // Printing the concatenated array
   console.log(Array3);

   // Calling Symbol.isConcatSpreadable symbol
   Array2[Symbol.isConcatSpreadable] = false;
   Array3 = Array1.concat(Array2);

   // Printing the concatenated array
   // after calling of Symbol.isConcatSpreadable symbol
   console.log(Array3);
</script>

Output:

 Array [1, 2, 3, 4, 5, 6]
 Array [1, 2, 3, Array [4, 5, 6]]

The complete list of JavaScript Symbol is listed below:

JavaScript Symbol Static Properties:

Properties	Description
hasInstance	Determine if a given constructor object recognizes the object as its instance.
isConcatSpreadable	Given object should be flattened to its array elements while using the Array.prototype.concat() method.
JavaScript Symbol.match	Regular expression against a string and this function is called using
replace	Replace the matched substring of a string.
search	Returns the index within a string that matches the regular expression.
split	Specify the method that splits a string at the indices that match a regular expression.
toStringTag	Creation of the default string description of an object.
unscopables	Specify an object value of whose own and inherited property names are excluded from the environment bindings.

JavaScript Static methods

Methods	Description
for()	The Symbol.for() is used to search for the given symbol
keyFor()	This key is retrieved from the global symbol registry.

JavaScript Symbol Instance Properties:

Properties	Description
description	Return the optional description of the specified symbol objects.

JavaScript Symbol Instance Methods:

Methods	Description
toString()	convert the specified symbol object into the string.
valueOf()	Return the primitive value of a given symbol object.
@@toPrimitive()	Convert a given symbol object to a primitive value.

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