Use Blocked Scoped Variables #9
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**'Let' and 'const' are block-scope variable declarations that can replace 'var' declarations in many cases.** `const` declares blocked-scoped variables that cannot be re-assigned. `let` declares block-scoped variables that can be changed. They are available since ES6 and are preferred over function-scope, modifiable `var` declarations, because they make it easier to reason about the code. When there are several variables declared in a statement, this refactoring does not change the declaration to prevent formatting breakages and linter issues. `var` declarations are only changed if they are used within block-scope, and only variables that are not modified are marked as `const`.
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'Let' and 'const' are block-scope variable declarations that can replace 'var' declarations in many cases.
constdeclares blocked-scoped variables that cannot be re-assigned.letdeclares block-scoped variables that can be changed. They are available since ES6 and are preferred over function-scope, modifiablevardeclarations, because they make it easier to reason about the code.When there are several variables declared in a statement, this refactoring does not change the declaration to prevent formatting breakages and linter issues.
vardeclarations are only changed if they are used within block-scope, and only variables that are not modified are marked asconst.