Can you use indexOf on objects in JavaScript?

Can you use indexOf on objects in JavaScript?

To find the index of an object in an array, by a specific property: Use the map() method to iterate over the array, returning only the value of the relevant property. Call the indexOf() method on the returned from map array. The indexOf method returns the index of the first occurrence of a value in an array.

How do I find the index of an object key?

Explanation

  1. Use .map() to get an array of values given a particular key: var values = object_array. map(function(o) { return o. your_key; });
  2. Now we just use .indexOf() to find the index of the key we want (which is, of course, also the index of the object we’re looking for): var index = values. indexOf(your_value);

How do you find the index of an object in an ArrayList?

The index of a particular element in an ArrayList can be obtained by using the method java. util. ArrayList. indexOf().

Is indexOf a loop?

indexOf does a bunch of type-checking and validation that the for loop and while loop ignore.

How can I display a JavaScript Object?

console.dir(object): Displays an interactive listing of the properties of a specified JavaScript object. This listing lets you use disclosure triangles to examine the contents of child objects.

How to list all methods of an object in JavaScript?

Objects overview.

  • Objects and properties.
  • Enumerate the properties of an object.
  • Creating new objects.
  • Inheritance.
  • Indexing object properties.
  • Defining properties for an object type.
  • Defining methods.
  • Using this for object references.
  • Defining getters and setters.

    • How to check if object has key in JavaScript?

    Number

  • Bigint
  • String
  • Boolean
  • Null
  • Undefined
  • Symbol
  • and Object is a non-primitive data type.

    • How to check a JavaScript object is a DOM object?

    Window Object: Window object is treated as a parent object to all of the objects.

  • Document Object: Once the window objects step is loaded into the HTML document then it becomes an object.
  • Form Object: Form objects are like the objects which are enclosed within the .. tag.