Convert string of character and number into integer?

Question

I want to convert this string "F1" into an integer 1.

For example

"F1" ===> 1 "F2" ===> 2 "F3" ===> 3

So far, this is what I've done

parseLevel: function(level) { var levels = { "F1": 1, "F2": 2 }; return levels[level]; }

Here's the function

parseLevel: function (level) { return parseInt(level, 10); }

I'm getting an error says it's NaN

Does your string always start with an "F"? And will it always have a number after the first "F"? — Nalin Ranjan
– Nalin Ranjan, Commented Mar 18, 2022 at 4:56
what result should it produce if the input is invalid? NaN or 0? — Nalin Ranjan
– Nalin Ranjan, Commented Mar 18, 2022 at 4:59

Sharp Dev · Accepted Answer · 2022-03-18 05:14:47Z

Here is an example of how you could parse any string and only use its digits. to parse an integer.

let s = "ajs382bop";//can be any string it will strip all non digits function stripAndReturnNumber(s){ return parseInt(s.replace(/\D/g, "")); //This will replace all non digits with nothing and leave all digits remaining. //Then it will return the resulting integer. } console.log(stripAndReturnNumber(s));//382

Nikhil Devadiga · Accepted Answer · 2022-03-18 04:56:35Z

Since the string you pass has a leading F in it; parseInt can't figure out what integer F1 could be so just strip the F of the string.

parseLevel: function (level) { return parseInt(level.slice(1), 10); }

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