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

JavaScript fundamental (ES6 Syntax): Exercise-190 with Solution

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

  • Create an object from val and compare it with val to determine if the passed value is primitive (i.e. not equal to the created object).

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const isPrimitive = val => !['object', 'function'].includes(typeof val) || val === null;

console.log(isPrimitive(null));
console.log(isPrimitive(50));
console.log(isPrimitive('Hello!'));
console.log(isPrimitive(false));
console.log(isPrimitive(Symbol()));
console.log(isPrimitive([]));

Sample Output:

true
true
true
true
true
false

Flowchart:

flowchart: Get a boolean determining if the passed value is primitive or not

Live Demo:

See the Pen javascript-basic-exercise-190-1 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program that will return true if an object looks like a Promise, false otherwise.
Next: Write a JavaScript program to check if the provided integer is a prime number or not.

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JavaScript: Tips of the Day

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring));

includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:

var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);

Ref: https://bit.ly/3fFFgZv