golf2.1.attempt2.js

a=b=0;require('fs').readFileSync(0,{encoding:'utf8'}).replace(/^(.).*(\d+)$/gm,(_,v,d)=>{a+=d*(v=='f'),b+=v=='d'?+d:v=='u'?-d:0});console.log(a*b)

golf2.1.js

console.log([...require('fs').readFileSync(0,{encoding:'utf8'}).matchAll(/^(.).*(\d+)$/gm)].reduce(([a,b],[_,v,d])=>[a+=d*(v=='f'),b+=v=='d'?+d:v=='u'?-d:0],[0,0]).reduce((a,b)=>a*b))

golf2.2-attemp2.js

a=b=c=0;require('fs').readFileSync(0,{encoding:'utf8'}).replace(/^(.).*(\d+)$/gm,(_,v,d)=>{a+=v=='d'?+d:v=='u'?-d:0,b+=(v=='f')*d,c+=(v=='f')*a*d});console.log(b*c)

golf2.2.js

console.log([...require('fs').readFileSync(0,{encoding:'utf8'}).matchAll(/^(.).*(\d+)$/gm)].reduce(([a,b,c],[_,v,d])=>[a+=v=='d'?+d:v=='u'?-d:0,b+=(v=='f')*d,c+=(v=='f')*a*d],[0,0,0]).slice(1).reduce((a,b)=>a*b))