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JavaScript: Check whether the given argument is a symbol

JavaScript fundamental (ES6 Syntax): Exercise-186 with Solution

Write a JavaScript program to check whether the given argument is a symbol.

  • Use typeof to check if a value is classified as a symbol primitive.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const isSymbol = val => typeof val === 'symbol';
console.log(isSymbol(Symbol('x')));
console.log(isSymbol(Symbol(1)));
console.log(isSymbol(Symbol(')')));

Sample Output:

true
true
true

Pictorial Presentation:

JavaScript Fundamental: Check whether the given argument is a symbol.
JavaScript Fundamental: Check whether the given argument is a symbol.

Flowchart:

flowchart: Check whether the given argument is a symbol

Live Demo:

See the Pen javascript-basic-exercise-186-1 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program that will return true if the specified value is undefined, false otherwise.
Next: Write a JavaScript program to check if the given argument is a string.

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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