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In computer programming, variable shadowing occurs when a variable declared within a certain scope (decision block, method, or inner class) has the same name as a variable declared in an outer scope.
Front End TechnologyJavascriptWeb Development. In programming, shadowing occurs when a variable declared in a certain scope (e.g. a local variable) has the same name as a variable in an outer scope (e.g. a global variable).
JavaScript Hoisting refers to the process whereby the interpreter appears to move the declaration of functions, variables or classes to the top of their scope, prior to execution of the code. Hoisting allows functions to be safely used in code before they are declared.
Declaring a variable with a name that already refers to another variable is called shadowing. In this case, you shadow a function argument.
The correct term is [Variable] Shadowing
In computer programming, variable shadowing occurs when a variable declared within a certain scope (decision block, method, or inner class) has the same name as a variable declared in an outer scope. This outer variable is said to be shadowed...
Functions in JavaScript are just function-objects stored within variables (or properties) that follow the same scope-chain/resolution rules as normal variables (or properties). This explains why the original can still be accessed as window.parseInt as well. It is the "IIFE" which introduces this new scope (functions are the only way to introduce new scope in JavaScript).
However, the ECMAScript Specification [5th Edition] does not use the term shadowing, nor can I find a specific replacement term. (The fundamental shadowing behavior is defined in "10.2.2.1 GetIdentifierReference" and related sections.)
It is not overloading and it is not overriding, which are entirely different. I have no idea where overshadowing (in this context) originated or how it is supposed to differ from "normal" [variable] shadowing. If the term shadowing didn't already exist to explain this behavior then -- from an English language viewpoint anyway -- overshadowing ("to make insignificant/inconsequential") might be more appropriate than shadowing ("to cast shadow on/darken").
Happy coding.
If it happened by accident/mistake, you would call it clobbering the original parseInt().
Otherwise, I believe I saw it referred to shadowing recently here on Stack Overflow.
More commonly called "shadowing".
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