Scope in JavaScript refers to context (or portion) of the code which determines the accessibility (visibility) of variables. In JavaScript, we have two types of scope, local , and global .

Global variables are a common source of logic errors, so keeping a variable in the smallest scope is always good practice. Conclusion Although variables are a fairly simple aspect of JavaScript ...

When a new function scope is declared, the variables in the surrounding context are made available to it. This is a simple idea—don’t let the fancy name fool you.