Should "const" be favored over "let"?

Glen Huang curvedmark at
Fri Apr 17 05:53:18 UTC 2015

I've completely replaced "var" with "let" in my es 2015 code, but I noticed most variables I introduced never change.

Should I replace them with "const"? Will there be any performance gain for most browsers? If so, should such performance gain be considered micro optimization?

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