Determine if a specific value is present in an array of objects using AngularJS

Question

Determine if a specific value is present in an array of objects using AngularJS

var arr = [ { id:1}, {id:2} ];
var obj = {id:1};
var result = arr.indexOf(obj.id) == -1;
console.log(result);

I am trying to determine if obj.id exists in the array arr[].
Please note: arr[] is an array of objects

javascript angularjs

Answer 1

Answer №1

Give this a shot...

    var array = [{ id:1}, {id:2}];
    var target={id:1};
    var idsArray = array.map(function(obj){
                               return obj.id
                          }); // create an array of all ids 
    var found = idsArray.indexOf(target.id) != -1 // check if target id is in array
    console.log(found);

Check out the Map and indexOf documentation for more info.

Answer 2

Give this a shot...

    var array = [{ id:1}, {id:2}];
    var target={id:1};
    var idsArray = array.map(function(obj){
                               return obj.id
                          }); // create an array of all ids 
    var found = idsArray.indexOf(target.id) != -1 // check if target id is in array
    console.log(found);

Check out the Map and indexOf documentation for more info.

Answer 3

Answer №2

Here's a solution that should function correctly:

const items = [{ id: 1 }, { id: 2 }];
const query = { id: 1 };
console.log(items.findIndex(item => item.id === query.id));

The indexOf method is useful for indexed arrays but may not work as expected when dealing with arrays of objects.

Answer 4

Here's a solution that should function correctly:

const items = [{ id: 1 }, { id: 2 }];
const query = { id: 1 };
console.log(items.findIndex(item => item.id === query.id));

The indexOf method is useful for indexed arrays but may not work as expected when dealing with arrays of objects.

Answer 5

Answer №3

Kindly make use of the code snippet below:

var arr = [ { id:1}, {id:2} ];
var obj={id:1}

function searchMatch(item) {
  return item.id === obj.id;
}

console.log(arr.findIndex(searchMatch));

Answer 6

Kindly make use of the code snippet below:

var arr = [ { id:1}, {id:2} ];
var obj={id:1}

function searchMatch(item) {
  return item.id === obj.id;
}

console.log(arr.findIndex(searchMatch));

Answer 7

Answer №4

An alternative approach is to utilize the .find method.

let a = [{
    id: 1
  }, {
    id: 2
  }],
  b = {
    id: 1
  },
  obj = a.find(function(itm) {
    return itm.id == b.id;
  });

console.log(obj)

Another useful function is .findIndex, which returns the index of an item in the array.

let a = [{
    id: 1
  }, {
    id: 2
  }],
  b = {
    id: 1
  },
  objIndex = a.findIndex(function(itm) {
    return itm.id == b.id;
  });

console.log(objIndex)

To retrieve all objects that meet a certain condition, you can employ the .filter function.

let a = [{
    id: 1
  }, {
    id: 2
  }],
  b = {
    id: 1
  },
  objArr =  a.filter(function(itm) {
      return itm.id == b.id;
  });

console.log(objArr)

Answer 8

An alternative approach is to utilize the .find method.

let a = [{
    id: 1
  }, {
    id: 2
  }],
  b = {
    id: 1
  },
  obj = a.find(function(itm) {
    return itm.id == b.id;
  });

console.log(obj)

Another useful function is .findIndex, which returns the index of an item in the array.

let a = [{
    id: 1
  }, {
    id: 2
  }],
  b = {
    id: 1
  },
  objIndex = a.findIndex(function(itm) {
    return itm.id == b.id;
  });

console.log(objIndex)

To retrieve all objects that meet a certain condition, you can employ the .filter function.

let a = [{
    id: 1
  }, {
    id: 2
  }],
  b = {
    id: 1
  },
  objArr =  a.filter(function(itm) {
      return itm.id == b.id;
  });

console.log(objArr)

Answer 9

Answer №5

In the Array.map() function, it compares the ID and its value, returning a Boolean value if the map is present, as highlighted by @Slava Utesinov.

var array = [{id: 1}, {id: 2}];
var obj = {id: 1};
if(array.map(item => item.id).indexOf(obj.id) != -1){
  console.log("Exists");
}else{
  console.log("Does not exist");
}

Answer 10

In the Array.map() function, it compares the ID and its value, returning a Boolean value if the map is present, as highlighted by @Slava Utesinov.

var array = [{id: 1}, {id: 2}];
var obj = {id: 1};
if(array.map(item => item.id).indexOf(obj.id) != -1){
  console.log("Exists");
}else{
  console.log("Does not exist");
}

Answer 11

Answer №6

give this a shot

let animals = [ { name:"lion", sound: "roar" }, {name:"dog", sound: "bark"} ];

let chosenAnimal = {name: "lion"};

console.log(animals.find(animal => animal.name === chosenAnimal.name)) // returns matched record

let animals = [{ name: "elephant", size: "large" }];

let chosenAnimal = { name: "giraffe" };

console.log(animals.find(animal => animal.name === chosenAnimal.name)) // returns undefined

Answer 12

give this a shot

let animals = [ { name:"lion", sound: "roar" }, {name:"dog", sound: "bark"} ];

let chosenAnimal = {name: "lion"};

console.log(animals.find(animal => animal.name === chosenAnimal.name)) // returns matched record

let animals = [{ name: "elephant", size: "large" }];

let chosenAnimal = { name: "giraffe" };

console.log(animals.find(animal => animal.name === chosenAnimal.name)) // returns undefined

Answer 13

Answer №7

To verify, you can utilize the Array.map() method in JavaScript. This function will compare the id property and its corresponding value.

Here is a snippet of functional code:

var array = [{
  id: 1
}, {
  id: 2
}];
var obj = {
  id: 1
};

if (array.map(item => item.id).indexOf(obj.id) != -1) {
  console.log("Item exists");
} else {
  console.log("Item does not exist");
}

Answer 14

To verify, you can utilize the Array.map() method in JavaScript. This function will compare the id property and its corresponding value.

Here is a snippet of functional code:

var array = [{
  id: 1
}, {
  id: 2
}];
var obj = {
  id: 1
};

if (array.map(item => item.id).indexOf(obj.id) != -1) {
  console.log("Item exists");
} else {
  console.log("Item does not exist");
}

Answer 15

Answer №8

If you're working with AngularJS, utilizing the Filter feature can be helpful.

var array1 = [{id:1}, {id:2}];
var object1 = {id:1};

var isFound = false;
var filteredResult = $filter('filter')(array1, {id: object1.id}, true);

if (filteredResult.length > 0) {
    isFound = true;
}

Answer 16

If you're working with AngularJS, utilizing the Filter feature can be helpful.

var array1 = [{id:1}, {id:2}];
var object1 = {id:1};

var isFound = false;
var filteredResult = $filter('filter')(array1, {id: object1.id}, true);

if (filteredResult.length > 0) {
    isFound = true;
}

Determine if a specific value is present in an array of objects using AngularJS

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

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