JavaScript: Return true if the specified value is undefined, false otherwise

JavaScript fundamental (ES6 Syntax): Exercise-185 with Solution

Write a JavaScript program that returns true if the specified value is undefined, false otherwise.

Note: Use the strict equality operator to check if the value and of val are equal to undefined.

• Use the strict equality operator to check if val is equal to undefined.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const isUndefined = val => val === undefined;
console.log(isUndefined(undefined));

Sample Output:

true

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-185-1 by w3resource (@w3resource) on CodePen.

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