JavaScript: Get the native type of a value

JavaScript fundamental (ES6 Syntax): Exercise-220 with Solution

Write a JavaScript program to get the native type of a value. Returns the lowercased constructor name of value, "undefined" or "null" if value is undefined or null.

• Return 'undefined' or 'null' if the value is undefined or null.
• Otherwise, use Object.prototype.constructor.name to get the name of the constructor.

Sample Solution:

JavaScript Code:

// Define a function 'getType' to determine the type of a value
const getType = v =>
  // Check if the value is undefined and return 'undefined' if true
  v === undefined ? 'undefined' :
  // Check if the value is null and return 'null' if true
  v === null ? 'null' :
  // If the value is not undefined or null, return the lowercase name of its constructor
  v.constructor.name.toLowerCase();

// Test the 'getType' function with a Set object
console.log(getType(new Set([1, 2, 3]))); // Output: 'set'

Output:

set

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-220-1 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to calculate the Hamming distance between two values.
Next: Write a JavaScript program to get a string of the form HH:MM:SS from a Date object.