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We have some questions here that discuss delete in a more abstracted way, but I'm looking for practical examples of when use of delete could be used, versus doing something such as setting the property to null or undefined.
The delete operator deletes a property of an object.
What's a case of a challenge faced somewhere, that delete was the best solution, versus something else?
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The delete operator removes a given property from an object. On successful deletion, it will return true , else false will be returned.
delete is the only true way to remove an object's properties without any leftovers, but it works ~100 times slower if you are using delete in loops. The alternative solution is setting the value to u n defined like object[key] = undefined . It doesn't fully delete the property, it just sets the value to undefined.
delete keyword is used to delete properties of an object in javaScript. Note: Delete keyword deletes the both value of the property and property also.
Does delete return any value? Explanation: The delete operator doesn't return any value. Its function is to delete the memory allocated for an object. This is done in reverse way as that new operator works.
When using an object as a hashmap, you can iterate over the object's properties using:
for (var key in obj) {
// ...
}
If some properties of that objects were set to null, their keys would be included there. By using delete you can remove their keys completely.
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