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Let's say we have an object with this format:
var thisIsObject= { 'Cow' : 'Moo', 'Cat' : 'Meow', 'Dog' : 'Bark' }; I wanted to do a function that removes by key:
removeFromObjectByKey('Cow'); 
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Use delete to Remove Object Keys The special JavaScript keyword delete is used to remove object keys (also called object properties). While you might think setting an object key equal to undefined would delete it, since undefined is the value that object keys that have not yet been set have, the key would still exist.
Using delete operator. When only a single key is to be removed we can directly use the delete operator specifying the key in an object. Syntax: delete(object_name.
No, JavaScript objects cannot have duplicate keys. The keys must all be unique.
To remove a property from all objects in an array:Use the Array. forEach() method to iterate over the array. On each iteration, use the delete operator to delete the specific property.
The delete operator allows you to remove a property from an object.
The following examples all do the same thing.
// Example 1 var key = "Cow"; delete thisIsObject[key]; // Example 2 delete thisIsObject["Cow"]; // Example 3 delete thisIsObject.Cow; If you're interested, read Understanding Delete for an in-depth explanation.
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