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Can we check if a property is in an object with JavaScript?
Following is the code to check if a property is in an object 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: 20px; font-weight: 500; color: blueviolet; } </style> </head> <body> <h1>Checking a property in an object</h1> <div class="result"></div> <button class="Btn">CLICK HERE</button> <h3>Click on the above button to check if firstName property is present in obj object</h3> <script> let resEle = document.querySelector(".result"); let obj = { firstName: "Rohan", lastName: "Sharma", age: 21 }; document.querySelector(".Btn").addEventListener("click", () => { if (obj.hasOwnProperty("firstName")) { resEle.innerHTML = "Object obj has firstName property"; } else { resEle.innerHTML = "Object obj does not have firstName property"; } }); </script> </body> </html> Output
On clicking the ‘CLICK HERE’ button −
Updated on: 2020-07-17T11:46:18+05:30
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