The JavaScript Symbol.keyFor() method is used to search for the key of a global symbol. It returns undefined if the symbol is not found.
Syntax:
Symbol.keyFor(symbol);
Symbol.keyFor(symbol);
Symbol.keyFor(symbol);
Parameters:
symbol: It represents the specific symbol for which the key has to be fine.
Returns:
Key corresponding to a specific symbol.
Example 1:
<!DOCTYPE html>
<html>
<body>
<script>
var alpha = Symbol.for("a");
document.write(Symbol.keyFor(alpha));
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<body>
<script>
var alpha = Symbol.for("a");
document.write(Symbol.keyFor(alpha));
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<body>
<script>
var alpha = Symbol.for("a");
document.write(Symbol.keyFor(alpha));
</script>
</body>
</html>
Example 2:
<!DOCTYPE html>
<html>
<body>
<script>
const globalSymbol = Symbol.for('w3schools');
document.write(Symbol.keyFor(globalSymbol));
document.write("</br>");
const localSymbol = Symbol();
document.write(Symbol.keyFor(localSymbol));
document.write("</br>");
document.write(Symbol.keyFor(Symbol.iterator));
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<body>
<script>
const globalSymbol = Symbol.for('w3schools');
document.write(Symbol.keyFor(globalSymbol));
document.write("</br>");
const localSymbol = Symbol();
document.write(Symbol.keyFor(localSymbol));
document.write("</br>");
document.write(Symbol.keyFor(Symbol.iterator));
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<body>
<script>
const globalSymbol = Symbol.for('w3schools');
document.write(Symbol.keyFor(globalSymbol));
document.write("</br>");
const localSymbol = Symbol();
document.write(Symbol.keyFor(localSymbol));
document.write("</br>");
document.write(Symbol.keyFor(Symbol.iterator));
</script>
</body>
</html>