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JavaScript JavaScript Foundations Numbers Parsing Numbers From Strings

JavaScript Numbers Q no 1 parseInt()

A variable named "boxWidth" already exists with a value of "640px". Create a new variable named "numWidth" and use the "parseInt" method to extract the numeric value from boxWidth's string value.

Hi Wesen,

What code are you trying?

2 Answers

Rich Donnellan
Rich Donnellan
Treehouse Moderator 27,696 Points


Short answer:

var numWidth = parseInt(boxWidth);

Long(er) answer:

Because boxWidth is already defined as has an assigned value, you can access this value by assigning it to the new variable numWidth.

var numWidth = boxWidth;

The parseInt() function (in this case) looks at the value of boxWidth and parses the string "640px" and returns an integer (640).

Final answer:

var numWidth = parseInt(boxWidth);

Check out this resource at Mozilla for a more in-depth explanation of parseInt().

Muhammad Rizwan
Muhammad Rizwan
8,595 Points

var numWidth = parseInt(boxWidth, 10);