What is the execution context in JavaScript?

What is the execution context in JavaScript?

The execution context is an abstract concept that holds information about the environment within which JavaScript code is executed. It includes the scope, the value of 'this', and the variables available at that point.

Can you explain the different types of execution contexts?

Sure! There are three main types of execution contexts: global context, function context, and eval context. The global context is where your code starts executing, function context is created whenever a function is invoked, and eval context is created by the eval function.

How does the execution context affect variable scope?

The execution context determines the scope of variables. Variables defined in a function context are not accessible outside that function, while global variables can be accessed anywhere in the code.

What is the role of 'this' in execution context?

'this' refers to the object that is executing the current function. Its value can change depending on how a function is called, which is influenced by the execution context.