Me: I'm a JavaScript expert.
Also me: *Googles array slice*
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The spec is constantly evolving. I remember the first time I saw code with "let A = " and I was like ... "wtf is let?"
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It's nice because let implies the variable will change, it's like types. Good luck figuring it out with var.
It depends for what language target you are coding for too. I believe Rust uses the same notation for variables