JavaScript: Get a boolean determining if the passed value is an object or not

JavaScript fundamental (ES6 Syntax): Exercise-194 with Solution

Check If Object

Write a JavaScript program to get a boolean determining if the passed value is an object or not.

• Uses the Object constructor to create an object wrapper for the given value.
• If the value is null or undefined, create and return an empty object.
• Otherwise, return an object of a type that corresponds to the given value.

Sample Solution:

JavaScript Code:

// Define a function 'isObject' that checks if the given value 'obj' is an object
const isObject = obj =>
  // Check if 'obj' is strictly equal to Object(obj)
  obj === Object(obj);

// Test cases to check if the values are objects
console.log(isObject([1, 2, 3, 4]));  
console.log(isObject([]));             
console.log(isObject(['Hello!']));     
console.log(isObject({ a: 1 }));      
console.log(isObject({}));           
console.log(isObject(true)); 

Output:

true
true
true
true
true
false

Flowchart:

Live Demo:

See the Pen javascript-fundamental-exercise-194 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that returns true if a value is an object and not null.
• Write a JavaScript function that checks whether an argument is a non-primitive object.
• Write a JavaScript program that uses Object.prototype.toString() to verify that a variable is an object.
• Write a JavaScript function that distinguishes objects from arrays, functions, and primitives.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to check if a value is object-like. Check if the provided value is not null and its typeof is equal to 'object'.
Next: Write a JavaScript program to check if a given argument is a number.