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canterberry/invertObject.js

Created February 22, 2016 16:33
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Code Golf: Hash Inversion: JavaScript Solution (165 characters)
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invertObject.js
var i,x,y,f,k=[],v=[];for(i in h){k.push(i);v.push(h[i]);}h={};for(i in v){x=v[i];y=k[i];f=(a,b)=>{b=h[a];h[a]=(b?b.map?b.concat([y]):[b,y]:y)};x.map?x.map(f):f(x);}
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