how to fix jslint The '&&' subexpression should be wrapped in parens error

Question

I put everything in parentheses but code below still throws error in jslint:

Problem at line 5 character 104: The \'&&\' subexpression should be wrap         


        

Answer 1

I think it wants this:

    if (((typeof (c1) === 'string') && (typeof (c2) === 'string') && (c1 !== null) && (c2 !== null)) && ((c1.trim()) === '') || ((c2.trim()) !== '')) {

wrap the 4 anded expressions on the left of the && at 100.