I do that using the for each function // write a functino to show the longest string from array const names = [ "Noman" , "John" , "Wickago" , "Omarfaru" , "Faruk" , "Shahin" ]; function findSting ( names ) { let max = 0 ; let name, size; names.forEach( function ( item ) { if (item.length > max) { max = item.length; name = item; size = max; } }) return ` Longest name: ${name} and Size: ${size} ` ; } console .log(findSting(names));