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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 .
Block scoping can be produced by wrapping the entire block in a function and then executing it – this is known as the immediately-invoked function expression pattern – or by declaring the variable using the let keyword.
A function definition starts with the name of the type of value that it returns or void to indicate that it does not return a value. This is followed by the function name, formal arguments in parentheses, and body lines in braces. In C++, a function declared in a class (as non-static) is called a member function or method.
2 comments Toggle One-time initialization with garbage collected resources subsection
Block scope can be produced by wrapping the entire block in a function and then executing it; this is known as the immediately-invoked function expression (IIFE) pattern. While JavaScript scope is simple—lexical, function-level—the associated initialization and name resolution rules are a cause of confusion.
U.S. President-elect Donald Trump refused on Tuesday to rule out using military or economic action to pursue acquisition of the Panama Canal and Greenland, part of a broader expansionist agenda he ...
An immediately invoked function that returns no value or an expression preceded by the void operator will prevent the browser from attempting to parse the result of the evaluation as a snippet of HTML markup:
For Ariana Grande and Cynthia Erivo, celebrating their nominations at the 2025 Golden Globe Awards called for flowers.. At the Academy Women's Luncheon presented by Chanel in Los Angeles on ...