require('./src/lenses').expose(global);varcompose=require('pointfree-fantasy').compose;// setup an easy test fnvartoUpperCase=function(x){returnx.toUpperCase();};// here's the data structurevaruser={name:"Bob",addresses:[{street:'99 Maple',zip:94004,type:'home'},{street:'2302 Powell',zip:94001,type:'work'}]}// make some lensesvarL=makeLenses(['name','addresses','street']);// compose the lensesvarsecondAddressesStreet=compose(L.addresses,L._num(2),L.street)// mess with the userover(secondAddressesStreet,toUpperCase,user)// { name: 'Bob', addresses: [ { street: '99 Maple', zip: 94004, type: 'home' }, { street: '2302 POWELL', zip: 94001, type: 'work' } ]}view(L.name,user)// 'Bob'set(L.name,'Kelly',user)// {name: "Kelly", addresses: [{street: '99 Maple', zip: 94004, type: 'home'}, {street: '2302 Powell', zip: 94001, type: 'work'}]}