How to check if all objects of array are included another array?

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I am trying to check if object array A includes objects from B.

let A = [
    { name: "Max" },
    { name: "Jhon" },
    { name: "Naton" },
]

let B = [
    { name: "Max" },
    { name: "Naton" },
]

So B has two objects that is in array A. How to check this ?

I am trying to achieve it with includes :

  for(let entry of this.b){
      if(this.a.includes(entry)){
        console.log('includes');
      }
    }

But I get false on includes.

The method Array.includes() compare the entries of the array with the given value. Because your array entries are objects, it will not match. You have to loop at the array yourself and make the comparison.

Array.some() loops on an array and returns true if you returns true at least one. This method is useful when you want to verify something. In our example, we want to verify if the array a contains the b entry.

const a = [{
    name: 'Max',
  },
  {
    name: 'Jhon',
  },
  {
    name: 'Naton',
  },
];

const b = [{
    name: 'Max',
  },
  {
    name: 'Naton',
  },
  {
    name: 'Daddy',
  },
];

console.log(b.map(x => a.some(y => y.name === x.name)));

How to find if two arrays contain any common item in Javascript , How do I check if an array contains another array? The method Array.includes() compare the entries of the array with the given value. Because your array entries are objects, it will not match. You have to loop at the array yourself and make the comparison. Array.some() loops on an array and returns true if you returns true at least one. This method is useful when you want to verify something.

You have to use another loop, then check the property name:

var a = [
  {name: "Max"},
  {name: "Jhon"},
  {name: "Naton"},
];
var b = [
  {name: "Max"},
  {name: "Naton"},
];

for(let entry of b){
  for(let entry2 of a){
    if(entry2.name == entry.name){
      console.log('includes', entry.name);
    }
  }
}

all (MATLAB Functions), [i]) > -1) { found = true; break; } } console. log(found); Combination of array filter and instanceOf operator, we can check whether the array contains an object or array includes the object. See the following code example. // app.js let obj = { author: 'KDL' } let list = [obj, obj]; let op = list.filter(data => data instanceof Object); console.log(op) See the following output.

When you use Array#includes() method it will always return false because it's comparing objects which aren't equal because they aren't referencing the same object.

You should compare objects properties and not whole objects, you can do it using Array#some() method like this:

for (let entry of this.b) {
  if (this.b.some(x => x.name === entry.name)) {
    console.log('includes');
  }
}

Demo:

A = [{
    name: "Max"
  },
  {
    name: "Jhon"
  },
  {
    name: "Naton"
  },
]

B = [{
    name: "Max"
  },
  {
    name: "Naton"
  },
]

//Filter objects that exists in both arrays
let result = A.filter(el=> B.some(x => x.name === el.name));
console.log(result);

Check if array contains all elements of another array, How do you check if an array contains another array in JavaScript? There are various methods to check an array includes an object or not. Using includes() Method: If array contains an object/element can be determined by using includes() method. This method returns true if the array contains the object/element else return false. Syntax: array.includes( element/object, startingPosition ) Example:

Checking If One Array Contains an Item from Another Array in, How do you check if all elements in an array are equal in C? The every method executes the provided callback function once for each element present in the array until it finds one where callback returns a falsy value. If such an element is found, the every method immediately returns false.

JavaScript Array every() Method, How do you check if all elements in an array are equal Matlab? Test if one array includes the elements of another You can just use a set difference (aka minus) to see if one array includes all elements of another not_included = [1,2,3] - (1..9). to_a not_included # => [] not_included = [1,2,3,'A'] - (1..9). to_a not_included # => ["A"] Use intersection to test if any of the one are in the other:

How to check whether an array is subset of another array using , Check if array contains all elements of another array To achieve this we will use two array functions array.every and array.includes. Once an action is executed, result of the action is added to results array of queue object. fromIndex Optional The position in this array at which to begin searching for valueToFind. The first character to be searched is found at fromIndex for positive values of fromIndex, or at arr.length + fromIndex for negative values of fromIndex (using the absolute value of fromIndex as the number of characters from the end of the array at which to start the search).

Comments
  • that'r right, you have all different objects with some same property values.
  • What is your expected output?
  • I want that I could check if array A contains array's B objects. So the output would be console.log('includes') for each similar object in both arrays.
  • you have to check the values of the property
  • How to check if all values are the same ?