Run results for: try, not numeric, cast to Numeric

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.42 Safari/537.36

Browser: Chrome 68

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Script Preparation code:

var notANumber = "foo";
var aNumber = 0;
var multiply = function(val){
  return val*2;
}

Tests:

try (fail)
try { multiply(notANumber); } catch(e) { }
not if - parseFloat (fail)
if (!isNaN(parseFloat(notANumber)) && isFinite(notANumber)) { multiply(notANumber); } else { }
not if - Number (fail)
if (Number(parseFloat(notANumber)) === notANumber) { multiply(notANumber); } else { }
try (pass)
try { multiply(aNumber); } catch(e) { }
not if - parseFloat (pass)
if (!isNaN(parseFloat(aNumber)) && isFinite(aNumber)) { multiply(aNumber); } else { }
not if - Number (pass)
if (Number(parseFloat(aNumber)) === aNumber) { multiply(aNumber); } else { }