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EcmaScript 6.0 Walk through
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====
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### 1. Understanding variable declare and scope
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| Declare | Scope |
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| ---- | ---- |
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| let | Block |
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| var | Function |
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| const | Block |
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| function | Block |
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| class | Block |
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| import | Module-Global |
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### 1.1 **var** vs **let** vs **const**
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#### var
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Simple variable declare in last javascript
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#### let
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let is like a **var** but it declares is block-scoped
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#### const
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Declare is block-scope like a **let** but it's value can't change
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