Objects in JavaScript can be thought of as associative arrays, mapping keys (properties) to values.
To remove a property from an object in JavaScript you use the delete
operator:
const o = { lastName: 'foo' }
o.hasOwnProperty('lastName') // true
delete o['lastName']
o.hasOwnProperty('lastName') // false
Note that when delete
is applied to an index property of an Array
, you will create a sparsely populated array (ie. an array with a missing index).
When working with instances of Array
, if you do not want to create a sparsely populated array - and you usually don't - then you should use Array#splice
or Array#pop
.
Note that the delete
operator in JavaScript does not directly free memory. Its purpose is to remove properties from objects. Of course, if a property being deleted holds the only remaining reference to an object o
, then o
will subsequently be garbage collected in the normal way.
Using the delete
operator can affect JavaScript engines' ability to optimise code.
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