I doing agree, it is not a javascript error ! again if i take the array exemple and the following code : var a = [1,2,3,4] // now i filter the array

I doing agree, it is not a javascript error ! again if i take the array exemple and the following code : var a = [1,2,3,4] // now i filter the array var b = a.filter(function(a){return a<0} ); // b = [] // now do something on b b.forEach(function(e){console.log(e)}) // will "fail" silently , because it will output nothing is what i'm doing stupid ? yes, but it is 100% valid from a javascript perspective. It is a coding error , but not a JS error.