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 ...

i.e. intuitively it looks like the variable will only be available within the block but it is accessible outside the block .. in javascript's case, because var doesn't make a block level ...