How do I remove a property from a JavaScript object

0 votes

 I create an object as follows:

let myObject = {
    "ircEvent": "PRIVMSG",
    "method": "newURI",
    "regex": "^http://.*"
};

What is the best way to remove the property regex to end up with new myObject as follows?

let myObject = {
    "ircEvent": "PRIVMSG",
    "method": "newURI"
};
Jun 8, 2020 in Java-Script by kartik
• 37,490 points
119 views

1 answer to this question.

0 votes

Objects in JavaScript can be thought of as maps between keys and values.

 The delete operator is used to remove these keys, more commonly known as object properties, one at a time.

var obj = {
  myProperty: 1    
}
console.log(obj.hasOwnProperty('myProperty')) // true
delete obj.myProperty
console.log(obj.hasOwnProperty('myProperty')) // false

The delete operator does not directly free memory, and it differs from simply assigning the value of null or undefined to a property, in that the property itself is removed from the object.

 Note:  If the value of a deleted property was a reference type (an object), and another part of your program still holds a reference to that object, then that object will, of course, not be garbage collected until all references to it have disappeared.

Hope it helps!

answered Jun 8, 2020 by Niroj
• 82,680 points

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