Fault in Javascript substring matching -


i writing javascript function works endswith(),it checks if string (first argument, str) ends given target string (second argument, target). 

function confirmending(str, target) {    tarlen=target.length;    strlen=str.length;    substring = str.slice(strlen-tarlen-1, strlen);    if(substring==target)      {return true;}    else       return false;      }    confirmending("sangha", "ha");
upon compilation,every time returns answer false. cannot find fault in code. appreciated.

take away -1 slice() function:

function confirmending(str, target) {    tarlen=target.length;    strlen=str.length;    substring = str.slice(strlen-tarlen, strlen);    if(substring==target)      {return true;}    else       return false;      }    console.log(confirmending("sangha", "ha"));  console.log(confirmending("sangha", "hda"));

shortened version:

function confirmending(str, target) {    var strlen = str.length;    return target == str.slice(strlen - target.length, strlen);  }    console.log(confirmending("sangha", "ha"));  console.log(confirmending("sangha", "hda"));

a version using lastindexof():

function confirmending(str, target) {    return str.lastindexof(target) == (str.length - target.length);  }    console.log(confirmending("sangha", "ha"));  console.log(confirmending("sangha", "hda"));  console.log(confirmending("hahahahahahaha", "ha"));


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