Why does JSLint tell me to use “=== undefined” instead of “typeof … === 'undefined'”?

Question

I coded the following:

showTitles = (typeof showTitles !== \'undefined\') ? showTitles : \'Y\';
showSelectGroup = (typeof showSelectGroup !== \'undefined\')          


        

Answer 1

Note that whether this is best practice in general is debatable, but if you want to make it work with JSLint, you could do this

showTitles = (showTitles !== undefined) ? showTitles : 'Y';