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Variable names with global scope—called global variables —are frequently considered bad practice, at least in some languages, due to the possibility of name collisions and unintentional masking, together with poor modularity, and function scope or block scope are considered preferable.

An immediately invoked function expression (or iife, pronounced iffy, ipa /ˈɪf.i/) is a programming language idiom which produces a lexical scope using function scoping It was popular in javascript [1] as a method of supporting modular programming before the introduction of more standardized solutions such as commonjs and es modules [2] immediately invoked function expressions can be. Block (programming) in computer programming, a block of source code is a grouping of statements that execute in sequential order The block structure is fundamental to structured programming, where control structures are formed with blocks. Previously, javascript only supported function scoping using the keyword var, but ecmascript 2015 added the keywords let and const, allowing javascript to support both block scoping and function scoping.

An individual lift transforms a local function (subroutine) into a global function It is a two step process, consisting of Eliminating free variables in the function by adding parameters Moving functions from a restricted scope to broader or.