Access specific object in array in Angular using its unique identifier

Question

Access specific object in array in Angular using its unique identifier

There is an array presented below:

this.questions = [
      {id: 1, question: "Do you feel a connection to a higher source and have a sense of comfort knowing that you are part of something greater than yourself?", category: "Spiritual", subs: []},
      {id: 2, question: "Do you feel you are free of unhealthy behavior that impacts your overall well-being?", category: "Habits", subs: []},
      {id: 3, question: "Do you feel you have healthy and fulfilling relationships?", category: "Relationships", subs: []},
      {id: 4, question: "Do you feel you have a sense of purpose and that you have a positive outlook about yourself and life?", category: "Emotional Well-being", subs: []},
      {id: 5, question: "Do you feel you have a healthy diet and that you are fueling your body for optimal health? ", category: "Eating Habits ", subs: []},
      {id: 6, question: "Do you feel that you get enough rest and that your stress level is healthy?", category: "Relaxation ", subs: []},
      {id: 7, question: "Do you feel you get enough physical activity for optimal health?", category: "Exercise ", subs: []},
      {id: 8, question: "Do you feel you practice self-care and go to the doctor regularly?", category: "Medical Maintenance", subs: []},
      {id: 9, question: "Do you feel satisfied with your income and economic stability?", category: "Financial", subs: []},
      {id: 10, question: "Do you feel you do fun things and laugh enough in your life?", category: "Play", subs: []},
      {id: 11, question: "Do you feel you have a healthy sense of balance in this area of your life?", category: "Work-life Balance", subs: []},
      {id: 12, question: "Do you feel a sense of peace and contentment  in your home? ", category: "Home Environment", subs: []},
      {id: 13, question: "Do you feel that you are challenged and growing as a person?", category: "Intellectual Wellbeing", subs: []},
      {id: 14, question: "Do you feel content with what you see when you look in the mirror?", category: "Self-image", subs: []},
      {id: 15, question: "Do you feel engaged at work and a sense of fulfillment with your job?", category: "Work Satisfaction", subs: []}

    ];

Another function exists:

getDimensions(id) {    
   //require logic for obtaining object from questions array by ID.      
}

In order to obtain the correct object based on ID from the array, how can I construct a map?

arrays json angularjs angular typescript

Answer 1

Answer №1

To solve this problem, you have the option to utilize .filter() or .find(). The key distinction lies in the fact that filter will loop through all elements and return those that meet the condition as an array, whereas find will only return the first matching element before stopping the iteration.

For example:

var questions = [
      {id: 1, question: "Do you feel a connection to a higher source and have a sense of comfort knowing that you are part of something greater than yourself?", category: "Spiritual", subs: []},
      {id: 2, question: "Do you feel you are free of unhealthy behavior that impacts your overall well-being?", category: "Habits", subs: []},
      ...
];

function getDimensionsByFilter(id){
  return questions.filter(x => x.id === id);
}

function getDimensionsByFind(id){
  return questions.find(x => x.id === id);
}

var test = getDimensionsByFilter(10);
console.log(test);

test = getDimensionsByFind(10);
console.log(test);

Answer 2

To solve this problem, you have the option to utilize .filter() or .find(). The key distinction lies in the fact that filter will loop through all elements and return those that meet the condition as an array, whereas find will only return the first matching element before stopping the iteration.

For example:

var questions = [
      {id: 1, question: "Do you feel a connection to a higher source and have a sense of comfort knowing that you are part of something greater than yourself?", category: "Spiritual", subs: []},
      {id: 2, question: "Do you feel you are free of unhealthy behavior that impacts your overall well-being?", category: "Habits", subs: []},
      ...
];

function getDimensionsByFilter(id){
  return questions.filter(x => x.id === id);
}

function getDimensionsByFind(id){
  return questions.find(x => x.id === id);
}

var test = getDimensionsByFilter(10);
console.log(test);

test = getDimensionsByFind(10);
console.log(test);

Answer 3

Answer №2

retrieveSize(ident) {
    let element = data.filter(value => {
        return value.ident == ident;
    });

    return element;   
}

Answer 4

retrieveSize(ident) {
    let element = data.filter(value => {
        return value.ident == ident;
    });

    return element;   
}

Answer 5

Answer №3

CASE STUDY 1

By utilizing the array.filter() method, we can retrieve an array of objects that meet our specified condition.
Take a look at the demonstration below:

var data = [
      {id: 1, name: "Alice", age: 25},
      {id: 2, name: "Bob", age: 30},
      {id: 3, name: "Charlie", age: 35}
];

function filterData(){
  console.clear();
  var filter_criteria = document.getElementById("criteria").value;
  var filtered_array = data.filter(x => x.age > filter_criteria);
  console.log(filtered_array);
}

button {
  background: #ff9900;
  color: black;
  border: none;
  border-radius: 5px;
  padding: 10px;
  cursor: pointer;
}

input {
  padding: 10px;
}

<div>
  <label for="criteria"></label>
  <input id="criteria" type="number" name="criteria" placeholder="Enter age criteria">
  <button onclick="filterData()">Filter Data</button>
</div>

CASE STUDY 2

With the assistance of array.find(), we can retrieve the first matching item from the array and terminate the search process.

var data = [
      {id: 1, name: "Alice", age: 25},
      {id: 2, name: "Bob", age: 30},
      {id: 3, name: "Charlie", age: 35}
];

function findData(){
  console.clear();
  var target_age = document.getElementById("age").value;
  var found_object = data.find(x => x.age == target_age);
  console.log(found_object);
}

button {
  background: #ff9900;
  color: black;
  border: none;
  border-radius: 5px;
  padding: 10px;
  cursor: pointer;
}

input {
  padding: 10px;
  width: 250px;
}

<div>
  <label for="age"></label>
  <input id="age" type="number" name="age" placeholder="Enter target age">
  <button onclick="findData()">Find Data</button>
</div>

Answer 6

CASE STUDY 1

By utilizing the array.filter() method, we can retrieve an array of objects that meet our specified condition.
Take a look at the demonstration below:

var data = [
      {id: 1, name: "Alice", age: 25},
      {id: 2, name: "Bob", age: 30},
      {id: 3, name: "Charlie", age: 35}
];

function filterData(){
  console.clear();
  var filter_criteria = document.getElementById("criteria").value;
  var filtered_array = data.filter(x => x.age > filter_criteria);
  console.log(filtered_array);
}

button {
  background: #ff9900;
  color: black;
  border: none;
  border-radius: 5px;
  padding: 10px;
  cursor: pointer;
}

input {
  padding: 10px;
}

<div>
  <label for="criteria"></label>
  <input id="criteria" type="number" name="criteria" placeholder="Enter age criteria">
  <button onclick="filterData()">Filter Data</button>
</div>

CASE STUDY 2

With the assistance of array.find(), we can retrieve the first matching item from the array and terminate the search process.

var data = [
      {id: 1, name: "Alice", age: 25},
      {id: 2, name: "Bob", age: 30},
      {id: 3, name: "Charlie", age: 35}
];

function findData(){
  console.clear();
  var target_age = document.getElementById("age").value;
  var found_object = data.find(x => x.age == target_age);
  console.log(found_object);
}

button {
  background: #ff9900;
  color: black;
  border: none;
  border-radius: 5px;
  padding: 10px;
  cursor: pointer;
}

input {
  padding: 10px;
  width: 250px;
}

<div>
  <label for="age"></label>
  <input id="age" type="number" name="age" placeholder="Enter target age">
  <button onclick="findData()">Find Data</button>
</div>

Answer 7

Answer №4

// This TypeScript code snippet is used in Angular 4+ projects        
const viewArray = [
          {id: 1, question: "Do you have a connection to something greater than yourself and find comfort in it?", category: "Spiritual", subs: []},
          {id: 2, question: "Are you free of unhealthy habits that affect your well-being?", category: "Habits", subs: []},
          {id: 3, question: "Do you enjoy healthy and fulfilling relationships?", category: "Relationships", subs: []},
          {id: 4, question: "Do you feel purposeful and optimistic about yourself and life?", category: "Emotional Well-being", subs: []},
          {id: 5, question: "Is your diet healthy and nourishing for optimal health?", category: "Eating Habits ", subs: []},
          {id: 6, question: "Do you rest enough and manage stress effectively?", category: "Relaxation ", subs: []},
          {id: 7, question: "Are you physically active enough for good health?", category: "Exercise ", subs: []},
          {id: 8, question: "Do you prioritize self-care and regular medical check-ups?", category: "Medical Maintenance", subs: []},
          {id: 9, question: "Are you content with your income and financial stability?", category: "Financial", subs: []},
          {id: 10, question: "Do you engage in fun activities and laughter often?", category: "Play", subs: []},
          {id: 11, question: "Do you maintain a healthy work-life balance?", category: "Work-life Balance", subs: []},
          {id: 12, question: "Do you feel peaceful and satisfied in your home environment? ", category: "Home Environment", subs: []},
          {id: 13, question: "Do you feel challenged and growing intellectually?", category: "Intellectual Wellbeing", subs: []},
          {id: 14, question: "Are you content with how you perceive yourself in the mirror?", category: "Self-image", subs: []},
          {id: 15, question: "Do you find fulfillment and engagement in your job?", category: "Work Satisfaction", subs: []}
    ];

         const arrayObj = any;
         const objectData = any;

          for (let index = 0; index < this.viewArray.length; index++) {
              this.arrayObj = this.viewArray[index];
              this.arrayObj.filter((x) => {
                if (x.id === id) {
                  this.objectData = x;
                }
              });
              console.log('Json Object Data by ID ==> ', this.objectData);
            }
          };

Answer 8

// This TypeScript code snippet is used in Angular 4+ projects        
const viewArray = [
          {id: 1, question: "Do you have a connection to something greater than yourself and find comfort in it?", category: "Spiritual", subs: []},
          {id: 2, question: "Are you free of unhealthy habits that affect your well-being?", category: "Habits", subs: []},
          {id: 3, question: "Do you enjoy healthy and fulfilling relationships?", category: "Relationships", subs: []},
          {id: 4, question: "Do you feel purposeful and optimistic about yourself and life?", category: "Emotional Well-being", subs: []},
          {id: 5, question: "Is your diet healthy and nourishing for optimal health?", category: "Eating Habits ", subs: []},
          {id: 6, question: "Do you rest enough and manage stress effectively?", category: "Relaxation ", subs: []},
          {id: 7, question: "Are you physically active enough for good health?", category: "Exercise ", subs: []},
          {id: 8, question: "Do you prioritize self-care and regular medical check-ups?", category: "Medical Maintenance", subs: []},
          {id: 9, question: "Are you content with your income and financial stability?", category: "Financial", subs: []},
          {id: 10, question: "Do you engage in fun activities and laughter often?", category: "Play", subs: []},
          {id: 11, question: "Do you maintain a healthy work-life balance?", category: "Work-life Balance", subs: []},
          {id: 12, question: "Do you feel peaceful and satisfied in your home environment? ", category: "Home Environment", subs: []},
          {id: 13, question: "Do you feel challenged and growing intellectually?", category: "Intellectual Wellbeing", subs: []},
          {id: 14, question: "Are you content with how you perceive yourself in the mirror?", category: "Self-image", subs: []},
          {id: 15, question: "Do you find fulfillment and engagement in your job?", category: "Work Satisfaction", subs: []}
    ];

         const arrayObj = any;
         const objectData = any;

          for (let index = 0; index < this.viewArray.length; index++) {
              this.arrayObj = this.viewArray[index];
              this.arrayObj.filter((x) => {
                if (x.id === id) {
                  this.objectData = x;
                }
              });
              console.log('Json Object Data by ID ==> ', this.objectData);
            }
          };

Access specific object in array in Angular using its unique identifier

Answer №1

Answer №2

Answer №3

Answer №4

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