在LODASH中，断言对象或数组中密钥是否存在的最佳方法是什么？

Question

In my project I can receive 2 different kinds of response:

var data ={
  'ADULT':{},
  'bounds':[],
  'checkInEligible':true,
  'departureDate':'2016-07-15',
  'id':'car'
}

or I can get also the response:

var data = {
  ADULT:{
    'confirmationNumber':'29YNK',
    'checkInEligible':true
  },
  bounds:[],
  departureDate:"2016-07-15",`enter code here`
  id:"air"
}

I need to assert with some lodash method that the key 'checkInEligible' exist at some level into the response.

I've tried with the method .some, but seems to work fine only with arrays and only for root level, because return true only when the object os at a root level.

I've tried this:

isCheckInEligible: function () {
    return _.some(data, function (value, key) {
        return key === 'checkInEligible' && value
    });
}

Or this:

isCheckInEligible: function () {
    return _.some(data, 'checkInEligible');
}

Can somebody help me with this lodash method or any other lodash method? But I HAVE TO use lodash.

Thanks!

Answer 1

Maybe using _.has ?

isCheckInEligible: () => {
    return _.has(data, 'checkInEligible') || _.has(data, 'ADULT.checkInEligible');
}

Answer 2

You can use lodash#some to traverse both objects and arrays to check if a certain key exists in any level. Just make sure to name the lodash#some iteratee to recursively traverse the object/array.

function hasKeyDeep(object, key) {
  return _.has(object, key) || _.isObject(object) &&
    _.some(object, _.partial(hasKeyDeep, _, key));
}

 function hasKeyDeep(object, key) { return _.has(object, key) || _.isObject(object) && _.some(object, _.partial(hasKeyDeep, _, key)); } console.log(hasKeyDeep({ 'ADULT':{}, 'bounds':[], 'checkInEligible':true, 'departureDate':'2016-07-15', 'id':'car' }, 'checkInEligible')); // => true console.log(hasKeyDeep({ 'ADULT':{}, 'bounds':[], 'departureDate':'2016-07-15', 'id':'car' }, 'checkInEligible')); // => false console.log(hasKeyDeep({ ADULT:{ 'confirmationNumber':'29YNK', 'checkInEligible':true }, bounds:[], departureDate:"2016-07-15", id:"air" }, 'checkInEligible')); // => true console.log(hasKeyDeep({ ADULT:{ 'confirmationNumber':'29YNK' }, bounds:[], departureDate:"2016-07-15", id:"air" }, 'checkInEligible')); // => false console.log(hasKeyDeep({ bounds:[{ 'checkInEligible': true, 'otherValue': 'another value' }] }, 'checkInEligible')); // => true console.log(hasKeyDeep({ bounds:[{ 'otherValue': 'another value' }] }, 'checkInEligible')); // => false console.log(hasKeyDeep({ a: [{ b: [{ c: [{ d: [{ 'checkInEligible': true }] }] }] }] }, 'checkInEligible')); // => true console.log(hasKeyDeep({ a: [{ b: [{ c: [{ d: [{ 'anotherKey': true }] }] }] }] }, 'checkInEligible')); // => false 

 body > div { top: 0; min-height: 100%; } 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script> 

Another approach is to use RegExp#test in a stringified object using JSON#stringify .

function hasKeyDeep(object, key) {
  return new RegExp('[{,]"' + key + '":')
    .test(JSON.stringify(object));
}

 function hasKeyDeep(object, key) { return new RegExp('[{,]"' + key + '":') .test(JSON.stringify(object)); } console.log(hasKeyDeep({ 'ADULT':{}, 'bounds':[], 'checkInEligible':true, 'departureDate':'2016-07-15', 'id':'car' }, 'checkInEligible')); // => true console.log(hasKeyDeep({ 'ADULT':{}, 'bounds':[], 'departureDate':'2016-07-15', 'id':'car' }, 'checkInEligible')); // => false console.log(hasKeyDeep({ ADULT:{ 'confirmationNumber':'29YNK', 'checkInEligible':true }, bounds:[], departureDate:"2016-07-15", id:"air" }, 'checkInEligible')); // => true console.log(hasKeyDeep({ ADULT:{ 'confirmationNumber':'29YNK' }, bounds:[], departureDate:"2016-07-15", id:"air" }, 'checkInEligible')); // => false console.log(hasKeyDeep({ bounds:[{ 'checkInEligible': true, 'otherValue': 'another value' }] }, 'checkInEligible')); // => true console.log(hasKeyDeep({ bounds:[{ 'otherValue': 'another value' }] }, 'checkInEligible')); // => false console.log(hasKeyDeep({ a: [{ b: [{ c: [{ d: [{ 'checkInEligible': true }] }] }] }] }, 'checkInEligible')); // => true console.log(hasKeyDeep({ a: [{ b: [{ c: [{ d: [{ 'anotherKey': true }] }] }] }] }, 'checkInEligible')); // => false 

 body > div { top: 0; min-height: 100%; } 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script> 

Answer 3

Here is a recursive check down the object has-a tree to see if any contained object has the attribute (object property) that you're looking for.

 function nestedHas(object, attrib) { if (_.has(object, attrib)) { return true; } for (let key in _.pickBy(object, _.isObject)) { if (nestedHas(object[key], attrib)) { return true; } } return false; } 

Note: This doesn't check for the key in arrays, just in objects.