A: A block-scoped variable is a variable that can only be accessed within the block where it was declared. This is the case for variables declared withletandconst. Q: What's the difference betweenvar,let, andconst? A:varis function-scoped and can be redeclared within its scope.letandcons...
The error "Cannot redeclare block-scoped variable" occurs when we redeclare a variable in the same block.