javascript includes() case insensitive

Question

lets say I have an array of filter strings that I need to loop and check against with other passed in string.

var filterstrings = [\'firststring\',\'secondst         


        

Answer 1

My option is comparing UPPER with UPPER or lower with lower transforming both sides (i did it often in SQL):

    var filterstrings = ['firststring','secondstring','thirDstrIng'];
    var passedinstring =  'ThIrDsTrInG3';
    
    //used for of just to make it more readable
    for (filterstring of filterstrings) {
        if (passedinstring.toUpperCase().includes(filterstring.toUpperCase())) {
            alert("string detected");
        }
    
    }

Prompts string detected