How do I remove objects from a javascript associative array?

Wednesday, 14 March 2018

Suppose I have this code:

var myArray = new Object();
myArray["firstname"] = "Bob";
myArray["lastname"] = "Smith";
myArray["age"] = 25;

Now if I wanted to remove "lastname"?....is there some equivalent of
myArray["lastname"].remove()?

(I need the element gone because the number of elements is important and I want to keep things clean.)

Answer

Use the "delete" keyword in Javascript.

delete myArray["lastname"];

EDIT:

In some JavaScript engine, the delete keyword might hurt performance as it will undo compile / JIT optimization.

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