reimplement lodash.get()

get.js

// basic reimplementation of https://lodash.com/docs#get

var util = require('util')

var obj1 = {
  'a': {
    'b': {
      'c': 1
    }
  }
}

var obj2 = {
  'a': [{
    'b': {
      'c': 2
    }
  },{
    'b': {
      'c': 3
    }
  }]
}

var pathA = 'a.b.c'
var pathB = 'a[0].b.c'
var pathC = 'a[1].b.c'

var get = function(object, path, defaultValue) {
  if (typeof(path) === 'string') {
    var paths = path.split('.')
    var current = object
    var returnValue = defaultValue
    var regex = /(\w+)\[(\d+)\]/g
    var result = paths.every(function(currentValue, index, array) {
      // regex to see if currentValue is an array index
      var matches = regex.exec(currentValue)
      var next
      // check to see if path is an array reference. if true then
      // match[1] is the object name
      // match[2] is the array index
      if (matches && current[matches[1]][matches[2]]) {
        next = current[matches[1]][matches[2]]
      }
      // we don't have an array, just an object name
      else if (current[currentValue]) {
        next = current[currentValue]
      }
      if (next) {
        current = next
        returnValue = current
        return true
      }
      else {
        returnValue = defaultValue
        return false
      }
    })
    return returnValue
  } else if (util.isArray(path)) {
    // TODO
  } else {
    return defaultValue;
  }
}

console.log(get(obj1, pathA, 'hello world'))
console.log(get(obj2, pathB, 'hello world'))
console.log(get(obj2, pathC, 'hello world'))
console.log(get(obj1, pathC, 'hello world'))
console.log(get(obj1, pathC))