Classes

Shred Talk

Data Modeling

Constructor Function and Prototypes: ES6 Classes

In most cases, the value of this is determined by how a function is called (runtime binding). It can’t be set by assignment during execution, and it may be different each time the function is called.
In the global execution context (outside of any function), this refers to the global object whether in strict mode or not.
Inside a function, the value of this depends on how the function is called.
e.g. : if code not in strict mode and the value of this is not set by the call, this will default to the global object, which is window in a browser.
In strict mode, however, if the value of this is not set when entering an execution context, it remains as undefined.To set the value of this to a particular value when calling a function, use call(), or apply()
The behavior of this in classes and functions is similar, since classes are functions under the hood. But there are some differences and caveats.