How to remove a property from JavaScript object ?
delete keyword is used to delete properties of an object in javaScript.
Syntax:
delete object.property or delete object[property]
Note:
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- Delete keyword deletes the both value of the property and property also.After deletion, the property can not be used.
- Delete operator is designed to used on object properties. It can not be used on variables or functions.
- Delete operator should not be used on predefined JavaScript object properties. It can cause problems.
Example 1: This example deletes the address property of an object.
<!DOCTYPE html> <html> <head> <title></title> </head> <body style = "text-align:center;"> <h1 style = "color:green;" > GeeksForGeeks </h1> <p id="demo">the address of person1 is address1</p> <button onClick="fun()">click </button> <script> function fun(){ let p = { name: "person1", age:50, address:"address1" }; delete p.address; document.getElementById("demo").innerHTML = "the address of "+ p.name +" is " + p.address; } </script> </body> </html> |
Output:
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Before clicking the button:
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After clicking the button:
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Before clicking the button:
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After clicking the button:
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Example 2: This example deletes the age property of an object.
<!DOCTYPE html> <html> <head> <title></title> </head> <body style = "text-align:center;"> <h1 style = "color:green;" > GeeksForGeeks </h1> <p id="demo">person1 is 50 years old.</p> <button onClick="fun()">click </button> <script> function fun(){ let p = { name: "person1", age:50, address:"address1" }; delete p.age; document.getElementById("demo").innerHTML = p.name + " is " + p.age + " years old. "; } </script> </body> </html> |
Output:
