JavaScript Tutorial

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Javascript Add Values to an Array of Objects

Sometimes, you may want to add a new data or item to an existing array of objects. An object is a collection of key-value pairs that can represent complex data. In this tutorial, we will learn how to add unique data or item to an array of objects. We will give two examples: in the first example, we will use the JavaScript push method, and in the second example, we will use the spread operator of JavaScript to achieve this functionality

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Add One or More Elements to the end of an array of Object using Push() Method

<script>
 let arrayOfObjects = [];

 function displayArray() {
  let newName = prompt("Enter the name:");
  let nameExists = arrayOfObjects.some(obj => obj.name === newName);
  if (nameExists) {
   alert("Name already exists. Cannot add duplicate names.");
   return;
  }
  arrayOfObjects.push({
   name: newName,
   role: 'Cricketer'
  });
 }
</script>

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Pasted Image

Use the Spread Operator to Add a Unique Property to an Array of Objects.

<script>
 let arrayOfObjects = [{
  name: 'Warner',
  age: 40
 }, {
  name: 'Root',
  age: 36
 }];

 function addObject() {
  const newObject = {
   name: nameValue,
   age: ageValue
  };
  const isDuplicate = arrayOfObjects.some(obj => {
   return obj.name === newObject.name && obj.age === newObject.age;
  });
  if (!isDuplicate) {
   arrayOfObjects = [...arrayOfObjects,
    newObject
   ];
  } else {
   alert('Duplicate object not added:', newObject);
  }
 }
</script>

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JavaScript Tutorial

Javascript Add Values to an Array of Objects

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Add One or More Elements to the end of an array of Object using Push() Method

Use the Spread Operator to Add a Unique Property to an Array of Objects.