Discovering the significance of a JavaScript object within a collection

Question

Discovering the significance of a JavaScript object within a collection

Greetings! I am a newcomer to the world of JavaScript and could really use some assistance with a specific issue that I'm currently facing.

Essentially, I have an array that is storing objects, each of which has an id and a variable i which is a number. My main query is this: how can I retrieve the value of i from the object array using the id value? The id that I will be using would have already been stored in the array along with an i value.

var i = 1;
var id;
var b = {}; 
var y = [];

if(condition) {

  b = {"123":i};

  y.push(b);

}

if(condition) {
  id = 123;
  //To retrieve the corresponding i value for id "123" from the object array y
  i = ?;
}

javascript arrays

Answer 1

Answer №1

Below is an illustration using Array#find

var hasOwn = Function.prototype.call.bind(Object.prototype.hasOwnProperty);
var i = 1;
var id;
var b = {};
var y = [];

var condition = true;
if (condition) {
  b = {
    "123": i
  };

  y.push(b);
}

if (condition) {
  id = 123;
  // Find corresponding i value for id "123" from object array y
  // i = ? ;
  var found = y.find(function(o) {
    return hasOwn(o, id);
  });
  var f = found ? found[id] : found;
  console.log(f);
}

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Answer 2

Below is an illustration using Array#find

var hasOwn = Function.prototype.call.bind(Object.prototype.hasOwnProperty);
var i = 1;
var id;
var b = {};
var y = [];

var condition = true;
if (condition) {
  b = {
    "123": i
  };

  y.push(b);
}

if (condition) {
  id = 123;
  // Find corresponding i value for id "123" from object array y
  // i = ? ;
  var found = y.find(function(o) {
    return hasOwn(o, id);
  });
  var f = found ? found[id] : found;
  console.log(f);
}

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/es5-shim/4.5.9/es5-shim.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/es5-shim/4.5.9/es5-sham.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/json3/3.3.2/json3.min.js"></script>
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Answer 3

Answer №2

To retrieve the value, simply use ObjectName[Key]. For example, you can access the value with b[123].

Answer 4

To retrieve the value, simply use ObjectName[Key]. For example, you can access the value with b[123].

Answer 5

Answer №3

There are numerous methods to accomplish this task. Below is just one example.

let array = [{id:4},{id:456}];

let object = array.filter(function(value){
   if(value.id===456)
  return value

})

console.log(object,'object')

Answer 6

There are numerous methods to accomplish this task. Below is just one example.

let array = [{id:4},{id:456}];

let object = array.filter(function(value){
   if(value.id===456)
  return value

})

console.log(object,'object')

Answer 7

Answer №4

let items = [
  {
    name: 'Leonardo',
    id: 100
  },
  {
    name: 'Donatello',
    id: 101
  },
  {
    name: 'Raphael',
    id: 102
  },
  {
    name: 'Michaelangelo',
    id: 103
  },
];

Start by using the Array.prototype.find() method to locate the object in the array with the specific ID and save it in the result variable. After that, display the value linked to the name property in that object.

const desiredID = 102;
const result = items.find(item => item.id === desiredID);

console.log(result.name);

Answer 8

let items = [
  {
    name: 'Leonardo',
    id: 100
  },
  {
    name: 'Donatello',
    id: 101
  },
  {
    name: 'Raphael',
    id: 102
  },
  {
    name: 'Michaelangelo',
    id: 103
  },
];

Start by using the Array.prototype.find() method to locate the object in the array with the specific ID and save it in the result variable. After that, display the value linked to the name property in that object.

const desiredID = 102;
const result = items.find(item => item.id === desiredID);

console.log(result.name);

Answer 9

Answer №5

To access the value of a specific object property in an array, you can iterate through the array and retrieve the value using the following method:

var data = [
    {"abc": "exampleA"},
    {"def": "exampleB"}
];

const key = "abc";
let retrievedValue;

data.some(obj => {
    if (obj[key] || obj[key] === 0) retrievedValue = obj[key];
});

console.log(retrievedValue);

Find more information about the "Array.some" method here

Answer 10

To access the value of a specific object property in an array, you can iterate through the array and retrieve the value using the following method:

var data = [
    {"abc": "exampleA"},
    {"def": "exampleB"}
];

const key = "abc";
let retrievedValue;

data.some(obj => {
    if (obj[key] || obj[key] === 0) retrievedValue = obj[key];
});

console.log(retrievedValue);

Find more information about the "Array.some" method here

Discovering the significance of a JavaScript object within a collection

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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