I wouldn't be too hard on yourself if you're not remembering things like splice or pop. I've been using Javascript for years (maybe 8) and I still have to look up shift/unshift functions on occasion. Unless you're using them on a daily basis you're likely to forget. Being able to recall that that functionality exists when you need it and recover the understanding from documentation is more important. Very generally speaking.
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I wouldn't be too hard on yourself if you're not remembering things like splice or pop. I've been using Javascript for years (maybe 8) and I still have to look up shift/unshift functions on occasion. Unless you're using them on a daily basis you're likely to forget. Being able to recall that that functionality exists when you need it and recover the understanding from documentation is more important. Very generally speaking.