The JavaScript exception "redeclaration of formal parameter" occurs when the same variable name occurs as a function parameter and is then redeclared using a let assignment in a function body again.
The let declaration declares re-assignable, block-scoped local variables, optionally initializing each to a value.
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Whether let and const are hoisted is a matter of definition debate. Referencing the variable in the block before the variable declaration always results in a ReferenceError, because the variable is in a "temporal dead zone" from the start of the block until the declaration is processed.
More precisely, let declarations are special-cased by for loops — if initialization is a let declaration, then every time, after the loop body is evaluated, the following happens: A new lexical scope is created with new let -declared variables. The binding values from the last iteration are used to re-initialize the new variables.
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TechCrunch: Snap is teaming up with Linktree to let users include links in their profiles
Snap announced today that it is rolling out an integration with the link-in-bio tool Linktree to let people show off their work and other profiles on Snapchat. The social network is late to allow ...