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What Actually Happens When You Use “new” in JavaScript
- The new keyword in JavaScript triggers a series of steps to create a new object, set up internal connections, and run the constructor function.
- JavaScript first creates an empty object when the new keyword is used, which is intended to become an instance of the function being called.
- After creating the object, JavaScript links it to the constructor function's prototype, enabling method and property sharing efficiently.
- By setting up this link, JavaScript avoids copying methods onto each object individually, ensuring a lightweight and efficient object model.
- When the constructor function runs, this inside the function points to the new object created by new, allowing properties to be attached to it.
- JavaScript checks the return value of the constructor - if an object is returned, it replaces the initially created object; otherwise, the original object is used.
- Automatic object creation and prototype linking by new simplify object creation, making constructors act as recipes for objects.
- Using prototypes for method sharing reduces memory usage by having all instances point to the same methods, improving memory efficiency.
- Constructors can return different objects, providing flexibility for special cases and enabling the creation of factory-like constructors.
- Each step in the new process in JavaScript ensures smooth object creation without manual setup, enhancing developer productivity and code clarity.
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