freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function-with-a-radix/index.md

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Use the parseInt Function with a Radix

Use the parseInt Function with a Radix

Problem explanation:

Use parseInt() in the convertToInteger function so it converts a binary number to an integer and returns it.

Hint 1

If you use a variable to assign the result of parseInt(str) to it, remember to return that variable. Otherwise you can just use a return statement for your function.

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Hint 2

In this exercise you need to "convert" a binary number into a decimal number using the radix parameter in order to specify the base on which the input number is represented on.

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Spoiler alert!

Solution ahead!

Code solution:

function convertToInteger(str) {
  return parseInt(str, 2);
}
convertToInteger("10011");

· Run code at repl.it.

Code explanation

• The function takes str and returns an integer instead of a string but "understanding" its a binary number instead of a decimal one thanks to the radix parameter (2).

Resources

• "parseInt()" - MDN JavaScript reference
• "Radix" - Wikipedia