Learn what variable scope and lifetime are in JavaSE, how they affect your code, and how to use them effectively and safely.

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.

It is generally accepted that variables with a narrow syntactic scope can have short names, whereas variables with a broad scope require more informative longer names. We study how names are given in ...

Pre-standard C++ had quirky scope behavior similar to your first example - variables declared specifically in a for loop's initializer statement remained in scope through the end of the block.