Web Reference: Nov 22, 2025 · In programming, inheritance refers to passing down characteristics from a parent to a child so that a new piece of code can reuse and build upon the features of an existing one. JavaScript implements inheritance by using objects. Each object has an internal link to another object called its prototype. May 6, 2022 · When we read a property from object, and it’s missing, JavaScript automatically takes it from the prototype. In programming, this is called “prototypal inheritance”. And soon we’ll study many examples of such inheritance, as well as cooler language features built upon it. All JavaScript objects inherit properties and methods from a prototype: The Object.prototype is on the top of the prototype inheritance chain. Date objects, Array objects, and all other objects inherit from Object.prototype. Sometimes you want to add new properties (or methods) to all existing objects of a given type.
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