Javascript check if each element of an object array is contained in another array

Question

I ave two arrays with objects in them

var requiredfileds=[
    {name:'CVR', value:'cvr_code'},
    {name:'NODE POINT VAL', value:'node_point_val'},

 ]

The second array

var results = [
    {name:'CVB', data:[12,11,233,445]}
    {name:'CVR', data:[125,1,-45,4]}
   ]

Now i want to check to ensure that all the names in the required fields array are in the results array. So from the above two examples i expect it to be false and get the required field missing to be {name:'NODE POINT VAL', value:'node_point_val'},

So i have tried (with es6)

this.is_valid = true;   
this.requiredfields.forEach(field=>{
  this.results.forEach(item=>{
    this.is_valid = item.name === field.name;
  })
})

But the above doesnt work, How do i proceed

@Barmar .every returns true if all values pass a test, I don't think that would give the op what they're looking for. — zfrisch
– zfrisch, Commented Jun 19, 2018 at 16:45
Didn't see that he also wanted the list of missing names, rather than just a true/false result. — Barmar
– Barmar, Commented Jun 19, 2018 at 16:48

lealceldeiro · Accepted Answer · 2018-06-19 18:01:59Z

Try this: filter the requiredfileds by applying a callback function. This callback function tests if some(any) of the items in results has the same name as the item in requiredfileds.

The result in missing is the filtered array which did not fulfilled the criterion (the one which are present in requiredfileds and not present, by name, in the results array).

If you simply want to know whether there were missing values or not you can just check the missing array length like this: !!missing.length.

var requiredfileds = [{
    name: 'CVR',
    value: 'cvr_code'
  },
  {
    name: 'NODE POINT VAL',
    value: 'node_point_val'
  },

];

var results = [{
  name: 'CVB',
  data: [12, 11, 233, 445]
}, {
  name: 'CVR',
  data: [125, 1, -45, 4]
}];

var missing = requiredfileds.filter(item => !results.some(resultItem => resultItem.name === item.name));

console.log('Any missing: ' + !!missing.length);

console.log(missing);

dhilt · Accepted Answer · 2018-06-19 17:01:18Z

3

ES6 one-liner with boolean result value:

const result = !requiredfileds.some(i => !results.some(j => j.name === i.name));

A version with first item that does not satisfy the requirement:

const badItem = requiredfileds.find(i => !results.some(j => j.name === i.name));

If you want to have an array of wrong items, replace .find with .filter:

const badItems = requiredfileds.filter(i => !results.some(j => j.name === i.name));

edited Jun 19, 2018 at 17:01

answered Jun 19, 2018 at 16:51

dhilt

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2 Comments

Geoff Over a year ago

i would also like to get the actually doesnt fullfill the condition

dhilt Over a year ago

@GEOFFREYMWANGI I made an update to get "wrong" item/items

Niladri Basu · Accepted Answer · 2018-06-19 16:48:26Z

2

IMHO, you want something like this perhaps:

var requiredfileds=[
    {name:'CVR', value:'cvr_code'},
    {name:'NODE POINT VAL', value:'node_point_val'}

 ]
 var results = [
    {name:'CVB', data:[12,11,233,445]},
    {name:'CVR', data:[125,1,-45,4]}
   ]
   

var resultsNames = results.map(result => result.name)

requiredfileds.forEach(requiredfiled => {
 if(!resultsNames.includes(requiredfiled.name)) console.log(requiredfiled)
})

answered Jun 19, 2018 at 16:48

Niladri Basu

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Comments

Doug Coburn · Accepted Answer · 2018-06-19 16:50:21Z

0

As @Barmer suggested... you could use Array.every. Combine with Array.some should give you what you want.

var requiredFields=[
    {name:'CVR', value:'cvr_code'},
    {name:'NODE POINT VAL', value:'node_point_val'},
];

var results = [
    {name:'CVB', data:[12,11,233,445]},
    {name:'CVR', data:[125,1,-45,4]}
];
   
const answer = requiredFields.every(item => results.some(test => item.name === test.name))

console.log(answer);

answered Jun 19, 2018 at 16:50

Doug Coburn

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2 Comments

Geoff Over a year ago

this looks neater but the console.log gives only a boolean if it has failed but how do i get the failed object the one not in results but its in required

Doug Coburn Over a year ago

Sorry @GEOFFREY, I didn't know that was a requirement. Looks like there are other answers that are better suited to give you that answer.

lealceldeiro · Accepted Answer · 2018-06-19 16:53:44Z

0

const entered = results.map(({ name }) => name);

const missing = requiredFields.filter(({name}) => !entered.includes(name))

edited Jun 19, 2018 at 16:53

lealceldeiro

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answered Jun 19, 2018 at 16:49

yoel neuman

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