❗variable redeclaration
🚧 under construction
(❗redeclaration ) JS is lenient with var, strict with let.
var redeclaration applied even in strict mode❗️ (even in strict mode)❗
var can shadow parameter even in strict mode❗️ - parameters can be shadowed by "var"❗
let redeclaration not allowed even in sloppy mode❗️ (even in sloppy mode)❗
var can shadow parameter even in strict mode❗️ - parameters can't be shadowed by "let"⛔
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