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Saved 1 byte thanks to @Shaggy
s=>Buffer(s).reduce(map(p,c)=>p*10+cc=>p=p*10+c-48,0p=0)|p
Try it online!Try it online!
s=>Buffer(s).reduce((p,c)=>p*10+c-48,0)
Try it online!
s=>Buffer(s).map(c=>p=p*10+c-48,p=0)|p
