Important Notice:

Practice-It will be discontinued as of November 1st, 2024. After this date, the website will remain online for a transitional period, but login will be restricted to University of Washington NetID authentication. This marks the next phase towards the platform's full retirement. Thank you for your use and support of the application over the years.

If you are looking for an alternative, a similar tool, CodeStepByStep, was developed independently by the original author of Practice-It, and is available at codestepbystep.com**

logo Practice-It logo

Main Page → Problems → Solve a Problem

binaryToDecimal

Language/Type: JavaScript binary parameters return
Related Links:
Author: Melissa Medsker-Galloway (on 2016/11/18)

Write a function named binaryToDecimal that accepts an integer parameter whose digits are meant to represent binary (base-2) digits, and returns an integer of that number's representation in decimal (base-10). For example, the call of binaryToDecimal(101011) should return 43.

If you find your solution returning unexpected double values, remember that JavaScript will convert integer (whole number) values to double values when divided by a number that is not a factor. You can avoid this conversion by using JavaScript's parseInt function which converts any number to an integer value. For example, the call of parseInt(2.13333) would return 2.

Constraints: Do not use a string in your solution.

Type your solution here:


This is a function problem. Write a JavaScript function as described. Do not write a complete program; just the function(s) above.

You must log in before you can solve this problem.


Log In

If you do not understand how to solve a problem or why your solution doesn't work, please contact your TA or instructor.
If something seems wrong with the site (errors, slow performance, incorrect problems/tests, etc.), please

Is there a problem? Contact a site administrator.