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Let
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var
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Origins
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ES2015(ES6)
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Pre ES2015
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Scope
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Globally scoped or blocke scoped
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Globally scoped or function scoped. Attached to window object.
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Global scope
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Not attached to window object.
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It is attached to window object.
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Hoisting
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Let is hoisted to top of its execution(either global or block) and unitialized
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Var is hoisted to top of its execution(either global or block) and unitialized as undefined
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Redclaraltion within scope
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no
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yes
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Reassign within scope
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yes
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yes
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