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Explain 'Not a constructor function' error in JavaScript?
The not a constructor function error occurs if we use an object or a variable as a constructor that isn’t a constructor.
Following is the code for not a constructor function error in JavaScript −
Example
<!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; } .result { font-size: 18px; font-weight: 500; color: rebeccapurple; } </style> </head> <body> <h1>Not a constructor function error</h1> <div class="result"></div> <button class="Btn">CLICK HERE</button> <h3>Click on the above button to use a variable as constructor</h3> <script> let resEle = document.querySelector(".result"); let BtnEle = document.querySelector(".Btn"); let b = 22; BtnEle.addEventListener("click", () => { try { new b(); } catch (err) { resEle.innerHTML = err; } }); </script> </body> </html>
Output
The above code will produce the following output −
On clicking the ‘CLICK HERE’ button −
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