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Expects ([str1, str2]).
([str1, str2])
f=a=>[...a+a].map(a,i=0)=>(a+a_,i)[i]?[a[i&1]=>a[i&1].match(/(.)\1*/g)?.[i>>1]]+f(a,i+1[i>>1]):"".join``
Attempt This Online!Attempt This Online!
f=(a,i=0)=>(a+a)[i]?[a[i&1].match(/(.)\1*/g)?.[i>>1]]+f(a,i+1):""
Attempt This Online!
a=>[...a+a].map((_,i)=>a[i&1].match(/(.)\1*/g)?.[i>>1]).join``
f=(a,i=j=0i=0)=>(a+a)[j][i]?[a[i][a[i&1].match(/(.)\1*/g)?.[j]]+f[i>>1]]+f(a,i^1,j+=ii+1):""
f=(a,i=j=0)=>(a+a)[j]?[a[i].match(/(.)\1*/g)?.[j]]+f(a,i^1,j+=i):""
