如何枚举复杂的javascript对象

Question

How to enumerate complex javascript object to get property paths to plain values?

In example if object is:

let complex = {
  person: {name: 'mat', age: 31},
  car: {
      model: 'Volsan',
      engine: 'large', 
      doors:[
        { side:'right front', color: 'blue' },
        { side:'left rear', color: 'red' }
      ]
   }
};

and outcome would be like:

complex.person.name
complex.person.age
complex.car.model
complex.car.engine
complex.car.doors[0].side
complex.car.doors[0].color
complex.car.doors[1].side
complex.car.doors[1].color

so that there would be only those values that are "ending the graph"

eg. it would be reverse _.at from lodash: https://lodash.com/docs/4.17.5#at

Answer 1

This recursive solution uses Array.map() , and Object.keys() to add the keys to a base path. Then we flatten the resulting array using Array.concat() and spread :

 const complex = { person: {name: 'mat', age: 31}, car: { model: 'Volsan', engine: 'large', doors:[ { side:'right front', color: 'blue' }, { side:'left rear', color: 'red' } ] } } const addDot = (b, s) => `${b}${b && '.'}${s}` const wrapBrackets = (b, s) => `${b}[${s}]` const mapPaths = (obj, base = '') => { if(typeof obj !== 'object') { return base; } const formatter = Array.isArray(obj) ? wrapBrackets : addDot; return [].concat(...Object.keys(obj) .map((key) => mapPaths(obj[key], formatter(base, key)))) }; const result = mapPaths(complex) console.log(result);