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ES6 - Symbol.for()
This function creates a symbol and adds to registry. If the symbol is already present in the registry it will return the same; else a new symbol is created in the global symbol registry.
Syntax
Symbol.for(key)
where, key is the identifier of the symbol
Example
The following example shows the difference between Symbol() and Symbol.for()
<script>
const userId = Symbol.for('userId') // creates a new Symbol in registry
const user_Id = Symbol.for('userId') // reuses already created Symbol
console.log(userId == user_Id)
const studentId = Symbol("studentID") // creates symbol but not in registry
const student_Id = Symbol.for("studentID")// creates a new Symbol in registry
console.log(studentId == student_Id)
</script>
The output of the above code will be as shown below −
true false
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