JavaScript: Get the native type of a value

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

Get Native Type of Value

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.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that returns the native type of a value by examining its constructor name in lowercase.
• Write a JavaScript function that uses Object.prototype.toString() to determine the precise type of a variable.
• Write a JavaScript program that distinguishes between primitive types and objects by returning their native type names.
• Write a JavaScript function that handles null and undefined values, returning "null" or "undefined" as appropriate.

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