On 9/15/14 4:43 PM, Shu-yu Guo wrote:
If you work with JS that contains `let` bindings, you may start encountering the following two errors:1. TypeError: redeclaration of variable foo To fix, rename the variable or remove the extra `let` if you are assigning to an already-bound variable. These are static errors. You may pass your JS through the syntax checker in the SpiderMonkey shell (-c) to detect them.
Much of the `let` fallout being reported is from variable redeclarations. For compatibility, perhaps TC39 should reconsider whether `let` redeclarations are worthy of being static errors.
JS allows you to redeclare vars. Rust allows you to redeclare variables with `let` (even changing the type!). SpiderMonkey's non-standard JS1.8 allowed you to redeclare variables with `let` (until Shu made it ES6 compatible). Maybe variable redeclarations are not such a big problem for JS developers.
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