FZs111

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factorial=n=>{for(x=i=1;i<n;)x*=++i;return x}

- factorial=n=>(x=1,[...{*[Symbol.iterator](){for(i=2;i<=n;i++)yield x*=i}}],x)
- factorial=n=>{for(x=i=1;i<n;)x*=++i;return x}