Web Reference: Jul 17, 2025 · The delete operator removes a property from an object. If the property's value is an object and there are no more references to the object, the object held by that property is eventually released automatically. The delete operator should not be used on the properties of any predefined JavaScript objects (Array, Boolean, Date, Function, Math, Number, RegExp, and String). Jan 6, 2025 · The delete operator in JavaScript removes properties from objects, including inherited ones, and creates holes in arrays without changing their length. If a deleted property holds an object with no other references, that object is automatically released by JavaScript's garbage collector over time.
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