I'd prefer it like this... // get users older than 90 a = data.results; b = a.filter(u => u.dob > 123456) seniorUsers = b.map(x => {name: x.name, age: x.age

I'd prefer it like this... // get users older than 90 a = data.results; b = a.filter(u => u.dob > 123456) seniorUsers = b.map(x => {name: x.name, age: x.age}) // self contained // comes out with one final var that is named to be used later on // other vars are obviously meant to be ignored and just placeholders // comment explains what is happening so each var doesn't need sacrifice comprehension speed