JavaScript Symbol.for() function

Javascript Web Development Object Oriented Programming

The Symbol.for() function searches runtime-wide symbol registery for a given symbol. If the symbol is found then it is returned otherwise a new symbol is created in the global symbol registery and simply returned.

Following is the code for symbol.for() function

Example

Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   div {
      font-size: 20px;
      font-weight: 500;
   }
</style>
</head>
<body>
<h1>JavaScript Symbol.for() function</h1>
<div class="sample"></div>
<button class="Btn">CLICK HERE</button>
<h3>
Click on the above button to get the symbols.
</h3>
<script>
   let fillEle = document.querySelector(".sample");
   let symbol = [];
   symbol.push(Symbol.for("New"));
   symbol.push(Symbol.for("Hello"));
   symbol.push(Symbol.for(345));
   document.querySelector(".Btn").addEventListener("click", () => {
      symbol.forEach((item) => (fillEle.innerHTML += item.toString() + "<br>"));
   });
</script>
</body>
</html>

Output

On clicking the “CLICK HERE” button −

AmitDiwan

Updated on: 07-May-2020

51 Views

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