A function to make deep checking on objects

checkDeepObject.js

/**
 * Run a simple check on every attribute of an object
 * It returns true if any attribute (non object) passes the test function
 */

function checkDeep(obj, fun) {
  for (let k in obj) {
    if (!obj.hasOwnProperty(k)) continue
    if (Array.isArray(obj[k])) {
      if (obj[k].some(fun))
        return true
    }
    else if (obj[k] === Object(obj[k])) {
      if (checkDeep(obj[k], fun))
        return true
    }
    else if (fun(obj[k], k, obj))
        return true
  }
 return false
}

/**
 * Example with a simple object
 */

let obj = {
  a: '1',
  b: {
    c: '3',
    d: ['A', 'B', 'C']
  },
  e: {
    f: {
      g: '' // should stop here
    },
    h: '8'
  }
}

checkDeep(obj, (v, i, a) => {
  console.log(`a[${i}] = ${v}; a:`, a)
  return !v
})