The Symbol() constructor is used to create a new symbol. The Symbol() constructor returns a value of the type of symbol with static properties. Every time we call the constructor a unique symbol is created. A Symbol constructor is a primitive data type having no object or no methods which are generally used as an identifier.
Syntax:
Symbol(str)
Arguments: The only argument is an optional string that is used for debugging but not to access the symbol. It means every time we call Symbol() constructor a unique symbol is created.
Return value: The Symbol() constructor returns a value of the type of symbol. And every time a unique symbol is returned.
Example 1: Below is the example of the Symbol() constructor.
function func() {
// symbol without any parameter
const sym1 = Symbol();
// symbol with parameter
const sym2 = Symbol(9);
// symbol with string
const sym3 = Symbol( "GFG" );
console.log(sym2.toString());
// Type of symbol 1
console.log( typeof sym1);
// Check symbol is equal to "GFG" or not
console.log(sym3 == "GFG" );
} func(); |
Symbol(9) symbol false
Example 2: In this example, the constructor creates a new primitive symbol const sym1 = Symbol();
function func() {
// symbol without any parameter
const sym1 = Symbol();
console.log(sym1);
} func(); |
Symbol()
Example 3: In this example, the constructor creates a new primitive symbol with an argument const sym2 = Symbol(9);
function func() {
// symbol with a parameter
const sym2 = Symbol(9);
console.log(sym2.toString());
} func(); |
Symbol(9)
Example 4: In this example, the constructor creates a new primitive symbol with a string argument const sym3 = Symbol(“GFG”);
function func() {
// symbol without a string parameter
const sym3 = Symbol( "GFG" );
console.log(sym3);
} func(); |
Symbol(GFG)
Example 5: In this example, we compare the return symbol with the string and return true if both are equal, otherwise, it returns false. Since the Symbol() constructor returns only a symbol, its output is false, console.log(sym3 == “GFG”);.
function func() {
// symbol with string
const sym3 = Symbol( "GFG" );
// Check symbol is equal to "GFG" or not
console.log(sym3 == "GFG" );
} func(); |
false