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JavaScript JavaScript Foundations Numbers Parsing Numbers From Strings

Posted by Richard Boothe
Richard Boothe
25,204 Points

Adding numbers to parseInt.

This isn't a question, but just more a quick tip to those that are trying to figure out how to add to parsed numbers like I was earlier. Jim doesn't explain this point in this particular video, so I thought I'd post it here to help ease the confusion I had. When adding to a variable that utilizes parseInt, the number being added must be placed outside of the quotation marks and parenthesis. Otherwise, the added number will be added to the end of the parsed numbers, like an additional string. An example:

var j = parseInt("197"); //will return 197.

var jTwo = parseInt("197 + 5"); //will return 1975.

var jThree = parseInt("197") + 5; //will return 202.

I hope this alleviates anyone's confusion that I had when thinking about this method. Good luck to you all.

Nicholas Hebb
Nicholas Hebb
18,872 Points

You should also specify the radix when using parseInt, e.g. var j = parseInt("197", 10); Otherwise, if the string being parsed starts with zero, it will be parsed as an octal.