Javascript golf

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var input = 'some.tree.structure.to.parse';
 
var wantedOutput = ['some', 'some.tree', 'some.tree.structure', 'some.tree.structure.to', 'some.tree.structure.to.parse'];
 

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function go(s){var l=n=s.split(".");l=n.length;for(i=1;i<l;i++){n[i]=n[i-1]+'.'+n[i]}return n}

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function go(s,n=s.split(".")){for(i=1;i<n.length;i++){n[i]=n[i-1]+'.'+n[i]}return n}

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function g(s){i=s.lastIndexOf('.');return~i?g(s.substr(0,i)).concat(s):[s]}